diff --git a/.readthedocs.yml b/.readthedocs.yml
index e142f2d9e..0413384f0 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,4 +1,8 @@
-requirements_file: requirements_docs.txt
+build:
+  image: latest
+
 python:
-  version: 3
-  setup_py_install: true
+  version: 3.7
+  pip_install: true
+  extra_requirements:
+    - docs
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index e3b2c958f..ceab3b44e 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -22,7 +22,7 @@ stages:
 
     - script: |
         python -m pip install --upgrade pip poetry
-        poetry install
+        poetry install --extras docs
       displayName: 'Install dependencies'
 
     - script: |
diff --git a/poetry.lock b/poetry.lock
index 4191e6c5d..92ab5c9c7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,8 +1,8 @@
 [[package]]
-category = "dev"
+category = "main"
 description = "A configurable sidebar-enabled Sphinx theme"
 name = "alabaster"
-optional = false
+optional = true
 python-versions = "*"
 version = "0.7.12"
 
@@ -46,10 +46,10 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Internationalization utilities"
 name = "babel"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.8.0"
 
@@ -57,12 +57,12 @@ version = "2.8.0"
 pytz = ">=2015.7"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python package for providing Mozilla's CA Bundle."
 name = "certifi"
-optional = false
+optional = true
 python-versions = "*"
-version = "2020.4.5.1"
+version = "2020.6.20"
 
 [[package]]
 category = "main"
@@ -84,7 +84,7 @@ python-versions = ">=3.6.1"
 version = "3.1.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Universal encoding detector for Python 2 and 3"
 name = "chardet"
 optional = false
@@ -100,7 +100,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "7.1.2"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Cross-platform colored terminal text."
 marker = "sys_platform == \"win32\" or platform_system == \"Windows\""
 name = "colorama"
@@ -125,7 +125,7 @@ description = "Code coverage measurement for Python"
 name = "coverage"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "5.1"
+version = "5.2"
 
 [package.extras]
 toml = ["toml"]
@@ -136,7 +136,7 @@ description = "croniter provides iteration for datetime object with cron like fo
 name = "croniter"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.3.32"
+version = "0.3.34"
 
 [package.dependencies]
 natsort = "*"
@@ -167,7 +167,7 @@ description = "Distribution utilities"
 name = "distlib"
 optional = false
 python-versions = "*"
-version = "0.3.0"
+version = "0.3.1"
 
 [[package]]
 category = "dev"
@@ -175,9 +175,10 @@ description = "Style checker for Sphinx (or other) RST documentation"
 name = "doc8"
 optional = false
 python-versions = "*"
-version = "0.8.0"
+version = "0.8.1"
 
 [package.dependencies]
+Pygments = "*"
 chardet = "*"
 docutils = "*"
 restructuredtext-lint = ">=0.7"
@@ -185,7 +186,7 @@ six = "*"
 stevedore = "*"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Docutils -- Python Documentation Utilities"
 name = "docutils"
 optional = false
@@ -206,32 +207,32 @@ description = "File identification library for Python"
 name = "identify"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "1.4.17"
+version = "1.4.23"
 
 [package.extras]
 license = ["editdistance"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Internationalized Domain Names in Applications (IDNA)"
 name = "idna"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.9"
+version = "2.10"
 
 [[package]]
 category = "main"
-description = "Enumerates all IP addresses on all network adapters of the system."
+description = "Cross-platform network interface and IP address enumeration library"
 name = "ifaddr"
 optional = false
 python-versions = "*"
-version = "0.1.6"
+version = "0.1.7"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Getting image size from png/jpeg/jpeg2000/gif file"
 name = "imagesize"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.2.0"
 
@@ -241,14 +242,14 @@ description = "Read metadata from Python packages"
 name = "importlib-metadata"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.6.0"
+version = "1.7.0"
 
 [package.dependencies]
 zipp = ">=0.5"
 
 [package.extras]
 docs = ["sphinx", "rst.linker"]
-testing = ["packaging", "importlib-resources"]
+testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
 
 [[package]]
 category = "dev"
@@ -257,13 +258,9 @@ marker = "python_version < \"3.7\""
 name = "importlib-resources"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.5.0"
+version = "3.0.0"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = "*"
-
 [package.dependencies.zipp]
 python = "<3.8"
 version = ">=0.4"
@@ -286,10 +283,10 @@ requirements = ["pipreqs", "pip-api"]
 xdg_home = ["appdirs (>=1.4.0)"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "A very fast and expressive template engine."
 name = "jinja2"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "2.11.2"
 
@@ -300,10 +297,10 @@ MarkupSafe = ">=0.23"
 i18n = ["Babel (>=0.8)"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Safely add untrusted strings to HTML/XML markup."
 name = "markupsafe"
-optional = false
+optional = true
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 version = "1.1.1"
 
@@ -313,7 +310,7 @@ description = "More routines for operating on iterables, beyond itertools"
 name = "more-itertools"
 optional = false
 python-versions = ">=3.5"
-version = "8.3.0"
+version = "8.4.0"
 
 [[package]]
 category = "main"
@@ -341,10 +338,10 @@ description = "Node.js virtual environment builder"
 name = "nodeenv"
 optional = false
 python-versions = "*"
-version = "1.3.5"
+version = "1.4.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Core utilities for Python packages"
 name = "packaging"
 optional = false
@@ -356,7 +353,7 @@ pyparsing = ">=2.0.2"
 six = "*"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python Build Reasonableness"
 name = "pbr"
 optional = false
@@ -385,7 +382,7 @@ description = "A framework for managing and maintaining multi-language pre-commi
 name = "pre-commit"
 optional = false
 python-versions = ">=3.6.1"
-version = "2.4.0"
+version = "2.6.0"
 
 [package.dependencies]
 cfgv = ">=2.0.0"
@@ -409,7 +406,7 @@ description = "library with cross-python path, ini-parsing, io, code, log facili
 name = "py"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.1"
+version = "1.9.0"
 
 [[package]]
 category = "main"
@@ -420,7 +417,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.20"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
 optional = false
@@ -428,7 +425,7 @@ python-versions = ">=3.5"
 version = "2.6.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python parsing module"
 name = "pyparsing"
 optional = false
@@ -441,7 +438,7 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=3.5"
-version = "5.4.2"
+version = "5.4.3"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
@@ -467,11 +464,11 @@ description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.9.0"
+version = "2.10.0"
 
 [package.dependencies]
 coverage = ">=4.4"
-pytest = ">=3.6"
+pytest = ">=4.6"
 
 [package.extras]
 testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
@@ -482,7 +479,7 @@ description = "Thin-wrapper around the mock package for easier use with pytest"
 name = "pytest-mock"
 optional = false
 python-versions = ">=3.5"
-version = "3.1.0"
+version = "3.2.0"
 
 [package.dependencies]
 pytest = ">=2.7"
@@ -518,12 +515,12 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "5.3.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python HTTP for Humans."
 name = "requests"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.23.0"
+version = "2.24.0"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
@@ -541,7 +538,7 @@ description = "reStructuredText linter"
 name = "restructuredtext-lint"
 optional = false
 python-versions = "*"
-version = "1.3.0"
+version = "1.3.1"
 
 [package.dependencies]
 docutils = ">=0.11,<1.0"
@@ -555,20 +552,20 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "1.15.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
 name = "snowballstemmer"
-optional = false
+optional = true
 python-versions = "*"
 version = "2.0.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python documentation generator"
 name = "sphinx"
-optional = false
+optional = true
 python-versions = ">=3.5"
-version = "3.0.4"
+version = "3.1.2"
 
 [package.dependencies]
 Jinja2 = ">=2.3"
@@ -591,14 +588,14 @@ sphinxcontrib-serializinghtml = "*"
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-lint = ["flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.770)", "docutils-stubs"]
+lint = ["flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.780)", "docutils-stubs"]
 test = ["pytest", "pytest-cov", "html5lib", "typed-ast", "cython"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Sphinx extension that automatically documents click applications"
 name = "sphinx-click"
-optional = false
+optional = true
 python-versions = "*"
 version = "2.3.2"
 
@@ -607,10 +604,10 @@ pbr = ">=2.0"
 sphinx = ">=1.5,<4.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "sphinxcontrib-applehelp is a sphinx extension which outputs Apple help books"
 name = "sphinxcontrib-applehelp"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.0.2"
 
@@ -619,10 +616,10 @@ lint = ["flake8", "mypy", "docutils-stubs"]
 test = ["pytest"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
 name = "sphinxcontrib-devhelp"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.0.2"
 
@@ -631,10 +628,10 @@ lint = ["flake8", "mypy", "docutils-stubs"]
 test = ["pytest"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
 name = "sphinxcontrib-htmlhelp"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.0.3"
 
@@ -643,10 +640,10 @@ lint = ["flake8", "mypy", "docutils-stubs"]
 test = ["pytest", "html5lib"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "A sphinx extension which renders display math in HTML via JavaScript"
 name = "sphinxcontrib-jsmath"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.0.1"
 
@@ -654,10 +651,10 @@ version = "1.0.1"
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
 name = "sphinxcontrib-qthelp"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.0.3"
 
@@ -666,10 +663,10 @@ lint = ["flake8", "mypy", "docutils-stubs"]
 test = ["pytest"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
 name = "sphinxcontrib-serializinghtml"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.1.4"
 
@@ -682,12 +679,15 @@ category = "dev"
 description = "Manage dynamic plugins for Python applications"
 name = "stevedore"
 optional = false
-python-versions = "*"
-version = "1.32.0"
+python-versions = ">=3.6"
+version = "3.0.0"
 
 [package.dependencies]
 pbr = ">=2.0.0,<2.1.0 || >2.1.0"
-six = ">=1.10.0"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=1.7.0"
 
 [[package]]
 category = "dev"
@@ -703,7 +703,7 @@ description = "tox is a generic virtualenv management and test command line tool
 name = "tox"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.15.1"
+version = "3.16.1"
 
 [package.dependencies]
 colorama = ">=0.4.1"
@@ -729,16 +729,16 @@ description = "Fast, Extensible Progress Meter"
 name = "tqdm"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
-version = "4.46.0"
+version = "4.47.0"
 
 [package.extras]
 dev = ["py-make (>=0.1.0)", "twine", "argopt", "pydoc-markdown"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 name = "urllib3"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 version = "1.25.9"
 
@@ -753,11 +753,11 @@ description = "Virtual Python Environment builder"
 name = "virtualenv"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "20.0.21"
+version = "20.0.26"
 
 [package.dependencies]
 appdirs = ">=1.4.3,<2"
-distlib = ">=0.3.0,<1"
+distlib = ">=0.3.1,<1"
 filelock = ">=3.0.0,<4"
 six = ">=1.9.0,<2"
 
@@ -767,11 +767,11 @@ version = ">=0.12,<2"
 
 [package.dependencies.importlib-resources]
 python = "<3.7"
-version = ">=1.0,<2"
+version = ">=1.0"
 
 [package.extras]
 docs = ["sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)", "proselint (>=0.10.2)"]
-testing = ["pytest (>=4)", "coverage (>=5)", "coverage-enable-subprocess (>=1)", "pytest-xdist (>=1.31.0)", "pytest-mock (>=2)", "pytest-env (>=0.6.2)", "pytest-randomly (>=1)", "pytest-timeout", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
+testing = ["pytest (>=4)", "coverage (>=5)", "coverage-enable-subprocess (>=1)", "pytest-xdist (>=1.31.0)", "pytest-mock (>=2)", "pytest-env (>=0.6.2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "pytest-freezegun (>=0.4.1)", "flaky (>=3)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
 
 [[package]]
 category = "dev"
@@ -783,11 +783,11 @@ version = "0.11.7"
 
 [[package]]
 category = "dev"
-description = "Measures number of Terminal column cells of wide-character codes"
+description = "Measures the displayed width of unicode strings in a terminal"
 name = "wcwidth"
 optional = false
 python-versions = "*"
-version = "0.1.9"
+version = "0.2.5"
 
 [[package]]
 category = "main"
@@ -812,8 +812,11 @@ version = "3.1.0"
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
+[extras]
+docs = ["sphinx", "sphinx_click"]
+
 [metadata]
-content-hash = "be9519ce090b0e6a1b186ba9f49b5c3df4f04b6f66106805f1340aa40f833102"
+content-hash = "ac85ba27a4011574728896038652bc9a3671620a8f5dd080c6fede22b3831eeb"
 python-versions = "^3.6.5"
 
 [metadata.files]
@@ -841,8 +844,8 @@ babel = [
     {file = "Babel-2.8.0.tar.gz", hash = "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38"},
 ]
 certifi = [
-    {file = "certifi-2020.4.5.1-py2.py3-none-any.whl", hash = "sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304"},
-    {file = "certifi-2020.4.5.1.tar.gz", hash = "sha256:51fcb31174be6e6664c5f69e3e1691a2d72a1a12e90f872cbdb1567eb47b6519"},
+    {file = "certifi-2020.6.20-py2.py3-none-any.whl", hash = "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"},
+    {file = "certifi-2020.6.20.tar.gz", hash = "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3"},
 ]
 cffi = [
     {file = "cffi-1.14.0-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:1cae98a7054b5c9391eb3249b86e0e99ab1e02bb0cc0575da191aedadbdf4384"},
@@ -894,41 +897,44 @@ construct = [
     {file = "construct-2.10.56.tar.gz", hash = "sha256:97ba13edcd98546f10f7555af41c8ce7ae9d8221525ec4062c03f9adbf940661"},
 ]
 coverage = [
-    {file = "coverage-5.1-cp27-cp27m-macosx_10_12_x86_64.whl", hash = "sha256:0cb4be7e784dcdc050fc58ef05b71aa8e89b7e6636b99967fadbdba694cf2b65"},
-    {file = "coverage-5.1-cp27-cp27m-macosx_10_13_intel.whl", hash = "sha256:c317eaf5ff46a34305b202e73404f55f7389ef834b8dbf4da09b9b9b37f76dd2"},
-    {file = "coverage-5.1-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:b83835506dfc185a319031cf853fa4bb1b3974b1f913f5bb1a0f3d98bdcded04"},
-    {file = "coverage-5.1-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:5f2294dbf7875b991c381e3d5af2bcc3494d836affa52b809c91697449d0eda6"},
-    {file = "coverage-5.1-cp27-cp27m-win32.whl", hash = "sha256:de807ae933cfb7f0c7d9d981a053772452217df2bf38e7e6267c9cbf9545a796"},
-    {file = "coverage-5.1-cp27-cp27m-win_amd64.whl", hash = "sha256:bf9cb9a9fd8891e7efd2d44deb24b86d647394b9705b744ff6f8261e6f29a730"},
-    {file = "coverage-5.1-cp27-cp27mu-manylinux1_i686.whl", hash = "sha256:acf3763ed01af8410fc36afea23707d4ea58ba7e86a8ee915dfb9ceff9ef69d0"},
-    {file = "coverage-5.1-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:dec5202bfe6f672d4511086e125db035a52b00f1648d6407cc8e526912c0353a"},
-    {file = "coverage-5.1-cp35-cp35m-macosx_10_12_x86_64.whl", hash = "sha256:7a5bdad4edec57b5fb8dae7d3ee58622d626fd3a0be0dfceda162a7035885ecf"},
-    {file = "coverage-5.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:1601e480b9b99697a570cea7ef749e88123c04b92d84cedaa01e117436b4a0a9"},
-    {file = "coverage-5.1-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:dbe8c6ae7534b5b024296464f387d57c13caa942f6d8e6e0346f27e509f0f768"},
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-    {file = "py-1.8.1.tar.gz", hash = "sha256:5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa"},
+    {file = "py-1.9.0-py2.py3-none-any.whl", hash = "sha256:366389d1db726cd2fcfc79732e75410e5fe4d31db13692115529d34069a043c2"},
+    {file = "py-1.9.0.tar.gz", hash = "sha256:9ca6883ce56b4e8da7e79ac18787889fa5206c79dcc67fb065376cd2fe03f342"},
 ]
 pycparser = [
     {file = "pycparser-2.20-py2.py3-none-any.whl", hash = "sha256:7582ad22678f0fcd81102833f60ef8d0e57288b6b5fb00323d101be910e35705"},
@@ -1100,16 +1108,16 @@ pyparsing = [
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
 ]
 pytest = [
-    {file = "pytest-5.4.2-py3-none-any.whl", hash = "sha256:95c710d0a72d91c13fae35dce195633c929c3792f54125919847fdcdf7caa0d3"},
-    {file = "pytest-5.4.2.tar.gz", hash = "sha256:eb2b5e935f6a019317e455b6da83dd8650ac9ffd2ee73a7b657a30873d67a698"},
+    {file = "pytest-5.4.3-py3-none-any.whl", hash = "sha256:5c0db86b698e8f170ba4582a492248919255fcd4c79b1ee64ace34301fb589a1"},
+    {file = "pytest-5.4.3.tar.gz", hash = "sha256:7979331bfcba207414f5e1263b5a0f8f521d0f457318836a7355531ed1a4c7d8"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-2.9.0.tar.gz", hash = "sha256:b6a814b8ed6247bd81ff47f038511b57fe1ce7f4cc25b9106f1a4b106f1d9322"},
-    {file = "pytest_cov-2.9.0-py2.py3-none-any.whl", hash = "sha256:c87dfd8465d865655a8213859f1b4749b43448b5fae465cb981e16d52a811424"},
+    {file = "pytest-cov-2.10.0.tar.gz", hash = "sha256:1a629dc9f48e53512fcbfda6b07de490c374b0c83c55ff7a1720b3fccff0ac87"},
+    {file = "pytest_cov-2.10.0-py2.py3-none-any.whl", hash = "sha256:6e6d18092dce6fad667cd7020deed816f858ad3b49d5b5e2b1cc1c97a4dba65c"},
 ]
 pytest-mock = [
-    {file = "pytest-mock-3.1.0.tar.gz", hash = "sha256:ce610831cedeff5331f4e2fc453a5dd65384303f680ab34bee2c6533855b431c"},
-    {file = "pytest_mock-3.1.0-py2.py3-none-any.whl", hash = "sha256:997729451dfc36b851a9accf675488c7020beccda15e11c75632ee3d1b1ccd71"},
+    {file = "pytest-mock-3.2.0.tar.gz", hash = "sha256:7122d55505d5ed5a6f3df940ad174b3f606ecae5e9bc379569cdcbd4cd9d2b83"},
+    {file = "pytest_mock-3.2.0-py3-none-any.whl", hash = "sha256:5564c7cd2569b603f8451ec77928083054d8896046830ca763ed68f4112d17c7"},
 ]
 python-dateutil = [
     {file = "python-dateutil-2.8.1.tar.gz", hash = "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c"},
@@ -1133,11 +1141,11 @@ pyyaml = [
     {file = "PyYAML-5.3.1.tar.gz", hash = "sha256:b8eac752c5e14d3eca0e6dd9199cd627518cb5ec06add0de9d32baeee6fe645d"},
 ]
 requests = [
-    {file = "requests-2.23.0-py2.py3-none-any.whl", hash = "sha256:43999036bfa82904b6af1d99e4882b560e5e2c68e5c4b0aa03b655f3d7d73fee"},
-    {file = "requests-2.23.0.tar.gz", hash = "sha256:b3f43d496c6daba4493e7c431722aeb7dbc6288f52a6e04e7b6023b0247817e6"},
+    {file = "requests-2.24.0-py2.py3-none-any.whl", hash = "sha256:fe75cc94a9443b9246fc7049224f75604b113c36acb93f87b80ed42c44cbb898"},
+    {file = "requests-2.24.0.tar.gz", hash = "sha256:b3559a131db72c33ee969480840fff4bb6dd111de7dd27c8ee1f820f4f00231b"},
 ]
 restructuredtext-lint = [
-    {file = "restructuredtext_lint-1.3.0.tar.gz", hash = "sha256:97b3da356d5b3a8514d8f1f9098febd8b41463bed6a1d9f126cf0a048b6fd908"},
+    {file = "restructuredtext_lint-1.3.1.tar.gz", hash = "sha256:470e53b64817211a42805c3a104d2216f6f5834b22fe7adb637d1de4d6501fb8"},
 ]
 six = [
     {file = "six-1.15.0-py2.py3-none-any.whl", hash = "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"},
@@ -1148,8 +1156,8 @@ snowballstemmer = [
     {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
 ]
 sphinx = [
-    {file = "Sphinx-3.0.4-py3-none-any.whl", hash = "sha256:779a519adbd3a70fc7c468af08c5e74829868b0a5b34587b33340e010291856c"},
-    {file = "Sphinx-3.0.4.tar.gz", hash = "sha256:ea64df287958ee5aac46be7ac2b7277305b0381d213728c3a49d8bb9b8415807"},
+    {file = "Sphinx-3.1.2-py3-none-any.whl", hash = "sha256:97dbf2e31fc5684bb805104b8ad34434ed70e6c588f6896991b2fdfd2bef8c00"},
+    {file = "Sphinx-3.1.2.tar.gz", hash = "sha256:b9daeb9b39aa1ffefc2809b43604109825300300b987a24f45976c001ba1a8fd"},
 ]
 sphinx-click = [
     {file = "sphinx-click-2.3.2.tar.gz", hash = "sha256:1b649ebe9f7a85b78ef6545d1dc258da5abca850ac6375be104d484a6334a728"},
@@ -1180,35 +1188,35 @@ sphinxcontrib-serializinghtml = [
     {file = "sphinxcontrib_serializinghtml-1.1.4-py2.py3-none-any.whl", hash = "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"},
 ]
 stevedore = [
-    {file = "stevedore-1.32.0-py2.py3-none-any.whl", hash = "sha256:a4e7dc759fb0f2e3e2f7d8ffe2358c19d45b9b8297f393ef1256858d82f69c9b"},
-    {file = "stevedore-1.32.0.tar.gz", hash = "sha256:18afaf1d623af5950cc0f7e75e70f917784c73b652a34a12d90b309451b5500b"},
+    {file = "stevedore-3.0.0-py3-none-any.whl", hash = "sha256:4ccc328424eb8b6b3d9def62976b686348b7064b2b470daf81ffd6251abd6d02"},
+    {file = "stevedore-3.0.0.tar.gz", hash = "sha256:182d557078b4f840f412f148e6f3c2ace83a3e206a020f35f6c97d3b8d91f180"},
 ]
 toml = [
     {file = "toml-0.10.1-py2.py3-none-any.whl", hash = "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"},
     {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},
 ]
 tox = [
-    {file = "tox-3.15.1-py2.py3-none-any.whl", hash = "sha256:322dfdf007d7d53323f767badcb068a5cfa7c44d8aabb698d131b28cf44e62c4"},
-    {file = "tox-3.15.1.tar.gz", hash = "sha256:8c9ad9b48659d291c5bc78bcabaa4d680d627687154b812fa52baedaa94f9f83"},
+    {file = "tox-3.16.1-py2.py3-none-any.whl", hash = "sha256:60c3793f8ab194097ec75b5a9866138444f63742b0f664ec80be1222a40687c5"},
+    {file = "tox-3.16.1.tar.gz", hash = "sha256:9a746cda9cadb9e1e05c7ab99f98cfcea355140d2ecac5f97520be94657c3bc7"},
 ]
 tqdm = [
-    {file = "tqdm-4.46.0-py2.py3-none-any.whl", hash = "sha256:acdafb20f51637ca3954150d0405ff1a7edde0ff19e38fb99a80a66210d2a28f"},
-    {file = "tqdm-4.46.0.tar.gz", hash = "sha256:4733c4a10d0f2a4d098d801464bdaf5240c7dadd2a7fde4ee93b0a0efd9fb25e"},
+    {file = "tqdm-4.47.0-py2.py3-none-any.whl", hash = "sha256:7810e627bcf9d983a99d9ff8a0c09674400fd2927eddabeadf153c14a2ec8656"},
+    {file = "tqdm-4.47.0.tar.gz", hash = "sha256:63ef7a6d3eb39f80d6b36e4867566b3d8e5f1fe3d6cb50c5e9ede2b3198ba7b7"},
 ]
 urllib3 = [
     {file = "urllib3-1.25.9-py2.py3-none-any.whl", hash = "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"},
     {file = "urllib3-1.25.9.tar.gz", hash = "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527"},
 ]
 virtualenv = [
-    {file = "virtualenv-20.0.21-py2.py3-none-any.whl", hash = "sha256:a730548b27366c5e6cbdf6f97406d861cccece2e22275e8e1a757aeff5e00c70"},
-    {file = "virtualenv-20.0.21.tar.gz", hash = "sha256:a116629d4e7f4d03433b8afa27f43deba09d48bc48f5ecefa4f015a178efb6cf"},
+    {file = "virtualenv-20.0.26-py2.py3-none-any.whl", hash = "sha256:c11a475400e98450403c0364eb3a2d25d42f71cf1493da64390487b666de4324"},
+    {file = "virtualenv-20.0.26.tar.gz", hash = "sha256:e10cc66f40cbda459720dfe1d334c4dc15add0d80f09108224f171006a97a172"},
 ]
 voluptuous = [
     {file = "voluptuous-0.11.7.tar.gz", hash = "sha256:2abc341dbc740c5e2302c7f9b8e2e243194fb4772585b991931cb5b22e9bf456"},
 ]
 wcwidth = [
-    {file = "wcwidth-0.1.9-py2.py3-none-any.whl", hash = "sha256:cafe2186b3c009a04067022ce1dcd79cb38d8d65ee4f4791b8888d6599d1bbe1"},
-    {file = "wcwidth-0.1.9.tar.gz", hash = "sha256:ee73862862a156bf77ff92b09034fc4825dd3af9cf81bc5b360668d425f3c5f1"},
+    {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
+    {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
 ]
 zeroconf = [
     {file = "zeroconf-0.25.1-py3-none-any.whl", hash = "sha256:265bc23ddcea3d76940b6bb5b85d8a5a4e20618e5e6c3da677794e7e26a0e8c5"},
diff --git a/pyproject.toml b/pyproject.toml
index 08fb277ca..61a840e76 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,16 +35,20 @@ android_backup = { version = "^0.2", optional = true }
 importlib_metadata = "^1.6.0"
 croniter = "^0.3.32"
 
+sphinx = { version = "^3.1", optional = true }
+sphinx_click = { version = "^2.3", optional = true }
+
+[tool.poetry.extras]
+docs = ["sphinx", "sphinx_click"]
+
 [tool.poetry.dev-dependencies]
 pytest = "^5.4.1"
 pytest-cov = "^2.8.1"
 pytest-mock = "^3.1.0"
 voluptuous = "^0.11.7"
 pre-commit = "^2.2.0"
-sphinx = "^3.0.1"
 doc8 = "^0.8.0"
 restructuredtext_lint = "^1.3.0"
-sphinx-click = "^2.3.2"
 tox = "^3.14.6"
 isort = "^4.3.21"
 cffi = "^1.14.0"