diff --git a/poetry.lock b/poetry.lock
index 68b195a47b1..165be3bd167 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -99,7 +99,7 @@ description = "Python package for providing Mozilla's CA Bundle."
 name = "certifi"
 optional = false
 python-versions = "*"
-version = "2019.11.28"
+version = "2020.4.5.1"
 
 [[package]]
 category = "main"
@@ -146,19 +146,28 @@ clikit = ">=0.4.0,<0.5.0"
 [[package]]
 category = "dev"
 description = "Composable command line interface toolkit"
-marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\" or python_version >= \"3.6\" and python_version < \"4.0\""
+marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\""
 name = "click"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "7.0"
 
+[[package]]
+category = "dev"
+description = "Composable command line interface toolkit"
+marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\" or python_version >= \"3.6\" and python_version < \"4.0\""
+name = "click"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "7.1.1"
+
 [[package]]
 category = "main"
 description = "CliKit is a group of utilities to build beautiful and testable command line interfaces."
 name = "clikit"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.4.2"
+version = "0.4.3"
 
 [package.dependencies]
 pastel = ">=0.2.0,<0.3.0"
@@ -230,7 +239,7 @@ 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 = "5.0.3"
+version = "5.0.4"
 
 [package.extras]
 toml = ["toml"]
@@ -238,7 +247,7 @@ toml = ["toml"]
 [[package]]
 category = "main"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
-marker = "python_version >= \"2.7\" and python_version < \"2.8\" and (sys_platform == \"linux2\" or sys_platform == \"linux\") or python_version >= \"3.4\" and python_version < \"3.5\" and (sys_platform == \"linux2\" or sys_platform == \"linux\") or python_version >= \"3.5\" and python_version < \"4.0\" and sys_platform == \"linux\""
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" and (sys_platform == \"linux2\" or sys_platform == \"linux\") or python_version >= \"3.4\" and python_version < \"3.5\" and (sys_platform == \"linux2\" or sys_platform == \"linux\")"
 name = "cryptography"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
@@ -248,6 +257,26 @@ version = "2.8"
 cffi = ">=1.8,<1.11.3 || >1.11.3"
 six = ">=1.4.1"
 
+[package.extras]
+docs = ["sphinx (>=1.6.5,<1.8.0 || >1.8.0)", "sphinx-rtd-theme"]
+docstest = ["doc8", "pyenchant (>=1.6.11)", "twine (>=1.12.0)", "sphinxcontrib-spelling (>=4.0.1)"]
+idna = ["idna (>=2.1)"]
+pep8test = ["flake8", "flake8-import-order", "pep8-naming"]
+test = ["pytest (>=3.6.0,<3.9.0 || >3.9.0,<3.9.1 || >3.9.1,<3.9.2 || >3.9.2)", "pretend", "iso8601", "pytz", "hypothesis (>=1.11.4,<3.79.2 || >3.79.2)"]
+
+[[package]]
+category = "main"
+description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" and (sys_platform == \"linux2\" or sys_platform == \"linux\") or python_version >= \"3.4\" and python_version < \"3.5\" and (sys_platform == \"linux2\" or sys_platform == \"linux\") or python_version >= \"3.5\" and python_version < \"4.0\" and sys_platform == \"linux\""
+name = "cryptography"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+version = "2.9"
+
+[package.dependencies]
+cffi = ">=1.8,<1.11.3 || >1.11.3"
+six = ">=1.4.1"
+
 [package.dependencies.enum34]
 python = "<3"
 version = "*"
@@ -292,7 +321,7 @@ marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_versi
 name = "enum34"
 optional = false
 python-versions = "*"
-version = "1.1.9"
+version = "1.1.10"
 
 [[package]]
 category = "dev"
@@ -383,7 +412,7 @@ description = "File identification library for Python"
 name = "identify"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "1.4.11"
+version = "1.4.14"
 
 [package.extras]
 license = ["editdistance"]
@@ -437,14 +466,47 @@ python-versions = ">=2.7,!=3.0,!=3.1,!=3.2,!=3.3"
 version = "1.0.2"
 
 [package.dependencies]
+[package.dependencies.typing]
+python = "<3.5"
+version = "*"
+
+[[package]]
+category = "dev"
+description = "Read resources from Python packages"
+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 = "1.4.0"
+
+[package.dependencies]
+[package.dependencies.contextlib2]
+python = "<3"
+version = "*"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = "*"
+
 [package.dependencies.pathlib2]
 python = "<3"
 version = "*"
 
+[package.dependencies.singledispatch]
+python = "<3.4"
+version = "*"
+
 [package.dependencies.typing]
 python = "<3.5"
 version = "*"
 
+[package.dependencies.zipp]
+python = "<3.8"
+version = ">=0.4"
+
+[package.extras]
+docs = ["sphinx", "rst.linker", "jaraco.packaging"]
+
 [[package]]
 category = "main"
 description = "IPv4/IPv6 manipulation library"
@@ -461,7 +523,7 @@ marker = "python_version >= \"3.5\" and python_version < \"4.0\" and sys_platfor
 name = "jeepney"
 optional = false
 python-versions = ">=3.5"
-version = "0.4.2"
+version = "0.4.3"
 
 [package.extras]
 dev = ["testpath"]
@@ -792,7 +854,7 @@ description = "Core utilities for Python packages"
 name = "packaging"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.1"
+version = "20.3"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
@@ -829,7 +891,7 @@ marker = "python_version >= \"3.6\" and python_version < \"4.0\""
 name = "pathspec"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.7.0"
+version = "0.8.0"
 
 [[package]]
 category = "dev"
@@ -953,7 +1015,7 @@ marker = "python_version >= \"2.7\" and python_version < \"2.8\" and (sys_platfo
 name = "pycparser"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.19"
+version = "2.20"
 
 [[package]]
 category = "dev"
@@ -971,6 +1033,14 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "2.5.2"
 
+[[package]]
+category = "dev"
+description = "Pygments is a syntax highlighting package written in Python."
+name = "pygments"
+optional = false
+python-versions = ">=3.5"
+version = "2.6.1"
+
 [[package]]
 category = "dev"
 description = "Pygments Github custom lexers."
@@ -1030,7 +1100,7 @@ description = "Python parsing module"
 name = "pyparsing"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.6"
+version = "2.4.7"
 
 [[package]]
 category = "main"
@@ -1160,7 +1230,7 @@ description = "YAML parser and emitter for Python"
 name = "pyyaml"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "5.3"
+version = "5.3.1"
 
 [[package]]
 category = "dev"
@@ -1169,7 +1239,7 @@ marker = "python_version >= \"3.6\" and python_version < \"4.0\""
 name = "regex"
 optional = false
 python-versions = "*"
-version = "2020.2.20"
+version = "2020.4.4"
 
 [[package]]
 category = "main"
@@ -1221,7 +1291,7 @@ requests = ">=2.0.1,<3.0.0"
 [[package]]
 category = "main"
 description = "scandir, a better directory iterator and faster os.walk()"
-marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version >= \"3.4\" and python_version < \"3.5\" or python_version < \"3.5\""
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version >= \"3.4\" and python_version < \"3.5\""
 name = "scandir"
 optional = false
 python-versions = "*"
@@ -1263,6 +1333,18 @@ optional = false
 python-versions = "!=3.0,!=3.1,!=3.2,!=3.3,>=2.6"
 version = "1.3.2"
 
+[[package]]
+category = "dev"
+description = "This library brings functools.singledispatch from Python 3.4 to Python 2.6-3.3."
+marker = "python_version < \"3.4\""
+name = "singledispatch"
+optional = false
+python-versions = "*"
+version = "3.4.0.3"
+
+[package.dependencies]
+six = "*"
+
 [[package]]
 category = "main"
 description = "Python 2 and 3 compatibility utilities"
@@ -1333,7 +1415,7 @@ marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_v
 name = "tornado"
 optional = false
 python-versions = ">= 3.5"
-version = "6.0.3"
+version = "6.0.4"
 
 [[package]]
 category = "dev"
@@ -1362,7 +1444,7 @@ 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 = "3.14.5"
+version = "3.14.6"
 
 [package.dependencies]
 colorama = ">=0.4.1"
@@ -1372,7 +1454,7 @@ pluggy = ">=0.12.0,<1"
 py = ">=1.4.17,<2"
 six = ">=1.14.0,<2"
 toml = ">=0.9.4"
-virtualenv = ">=16.0.0"
+virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
 
 [package.dependencies.importlib-metadata]
 python = "<3.8"
@@ -1407,7 +1489,7 @@ marker = "python_version >= \"3.5.0\" and python_version < \"3.5.4\""
 name = "typing-extensions"
 optional = false
 python-versions = "*"
-version = "3.7.4.1"
+version = "3.7.4.2"
 
 [[package]]
 category = "main"
@@ -1452,7 +1534,7 @@ description = "Virtual Python Environment builder"
 name = "virtualenv"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "20.0.7"
+version = "20.0.17"
 
 [package.dependencies]
 appdirs = ">=1.4.3,<2"
@@ -1470,7 +1552,7 @@ version = ">=1.0,<2"
 
 [package.extras]
 docs = ["sphinx (>=2.0.0,<3)", "sphinx-argparse (>=0.2.5,<1)", "sphinx-rtd-theme (>=0.4.3,<1)", "towncrier (>=19.9.0rc1)", "proselint (>=0.10.2,<1)"]
-testing = ["pytest (>=4.0.0,<6)", "coverage (>=4.5.1,<6)", "pytest-mock (>=2.0.0,<3)", "pytest-env (>=0.6.2,<1)", "packaging (>=20.0)", "xonsh (>=0.9.13,<1)"]
+testing = ["pytest (>=4.0.0,<6)", "coverage (>=4.5.1,<6)", "pytest-mock (>=2.0.0,<3)", "pytest-env (>=0.6.2,<1)", "pytest-timeout (>=1.3.4,<2)", "packaging (>=20.0)", "xonsh (>=0.9.16,<1)"]
 
 [[package]]
 category = "dev"
@@ -1478,7 +1560,7 @@ description = "Measures number of Terminal column cells of wide-character codes"
 name = "wcwidth"
 optional = false
 python-versions = "*"
-version = "0.1.8"
+version = "0.1.9"
 
 [[package]]
 category = "main"
@@ -1491,6 +1573,7 @@ version = "0.5.1"
 [[package]]
 category = "main"
 description = "Backport of pathlib-compatible object wrapper for zip files"
+marker = "python_version < \"3.8\" or python_version >= \"3.5\" and python_version < \"3.8\""
 name = "zipp"
 optional = false
 python-versions = ">=2.7"
@@ -1539,8 +1622,8 @@ cachy = [
     {file = "cachy-0.3.0.tar.gz", hash = "sha256:186581f4ceb42a0bbe040c407da73c14092379b1e4c0e327fdb72ae4a9b269b1"},
 ]
 certifi = [
-    {file = "certifi-2019.11.28-py2.py3-none-any.whl", hash = "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3"},
-    {file = "certifi-2019.11.28.tar.gz", hash = "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"},
+    {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"},
 ]
 cffi = [
     {file = "cffi-1.14.0-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:1cae98a7054b5c9391eb3249b86e0e99ab1e02bb0cc0575da191aedadbdf4384"},
@@ -1587,10 +1670,12 @@ cleo = [
 click = [
     {file = "Click-7.0-py2.py3-none-any.whl", hash = "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13"},
     {file = "Click-7.0.tar.gz", hash = "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"},
+    {file = "click-7.1.1-py2.py3-none-any.whl", hash = "sha256:e345d143d80bf5ee7534056164e5e112ea5e22716bbb1ce727941f4c8b471b9a"},
+    {file = "click-7.1.1.tar.gz", hash = "sha256:8a18b4ea89d8820c5d0c7da8a64b2c324b4dabb695804dbfea19b9be9d88c0cc"},
 ]
 clikit = [
-    {file = "clikit-0.4.2-py2.py3-none-any.whl", hash = "sha256:95394982cfa460a77ded2f173380a958e5f90c16972307c19d79b96f6e335326"},
-    {file = "clikit-0.4.2.tar.gz", hash = "sha256:f67336462800078e0896cf6ecfa3b460dfea4dfa01de659388a4ff0d83c8d6ca"},
+    {file = "clikit-0.4.3-py2.py3-none-any.whl", hash = "sha256:71e321b7795a2a6c4888629f43365d52db071737e668ab16861121d7dd3ada09"},
+    {file = "clikit-0.4.3.tar.gz", hash = "sha256:6e2d7e115e7c7b35bceb0209109935ab2f9ab50910e9ff2293f7fa0b7abf973e"},
 ]
 colorama = [
     {file = "colorama-0.4.1-py2.py3-none-any.whl", hash = "sha256:f8ac84de7840f5b9c4e3347b3c1eaa50f7e49c2b07596221daec5edaabbd7c48"},
@@ -1639,37 +1724,37 @@ coverage = [
     {file = "coverage-4.5.4-cp37-cp37m-win_amd64.whl", hash = "sha256:23cc09ed395b03424d1ae30dcc292615c1372bfba7141eb85e11e50efaa6b351"},
     {file = "coverage-4.5.4-cp38-cp38-macosx_10_13_x86_64.whl", hash = "sha256:141f08ed3c4b1847015e2cd62ec06d35e67a3ac185c26f7635f4406b90afa9c5"},
     {file = "coverage-4.5.4.tar.gz", hash = "sha256:e07d9f1a23e9e93ab5c62902833bf3e4b1f65502927379148b6622686223125c"},
-    {file = "coverage-5.0.3-cp27-cp27m-macosx_10_12_x86_64.whl", hash = "sha256:cc1109f54a14d940b8512ee9f1c3975c181bbb200306c6d8b87d93376538782f"},
-    {file = "coverage-5.0.3-cp27-cp27m-macosx_10_13_intel.whl", hash = "sha256:be18f4ae5a9e46edae3f329de2191747966a34a3d93046dbdf897319923923bc"},
-    {file = "coverage-5.0.3-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:3230d1003eec018ad4a472d254991e34241e0bbd513e97a29727c7c2f637bd2a"},
-    {file = "coverage-5.0.3-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:e69215621707119c6baf99bda014a45b999d37602cb7043d943c76a59b05bf52"},
-    {file = "coverage-5.0.3-cp27-cp27m-win32.whl", hash = "sha256:1daa3eceed220f9fdb80d5ff950dd95112cd27f70d004c7918ca6dfc6c47054c"},
-    {file = "coverage-5.0.3-cp27-cp27m-win_amd64.whl", hash = "sha256:51bc7710b13a2ae0c726f69756cf7ffd4362f4ac36546e243136187cfcc8aa73"},
-    {file = "coverage-5.0.3-cp27-cp27mu-manylinux1_i686.whl", hash = "sha256:9bea19ac2f08672636350f203db89382121c9c2ade85d945953ef3c8cf9d2a68"},
-    {file = "coverage-5.0.3-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:5012d3b8d5a500834783689a5d2292fe06ec75dc86ee1ccdad04b6f5bf231691"},
-    {file = "coverage-5.0.3-cp35-cp35m-macosx_10_12_x86_64.whl", hash = "sha256:d513cc3db248e566e07a0da99c230aca3556d9b09ed02f420664e2da97eac301"},
-    {file = "coverage-5.0.3-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:3dbb72eaeea5763676a1a1efd9b427a048c97c39ed92e13336e726117d0b72bf"},
-    {file = "coverage-5.0.3-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:15cf13a6896048d6d947bf7d222f36e4809ab926894beb748fc9caa14605d9c3"},
-    {file = "coverage-5.0.3-cp35-cp35m-win32.whl", hash = "sha256:fca1669d464f0c9831fd10be2eef6b86f5ebd76c724d1e0706ebdff86bb4adf0"},
-    {file = "coverage-5.0.3-cp35-cp35m-win_amd64.whl", hash = "sha256:1e44a022500d944d42f94df76727ba3fc0a5c0b672c358b61067abb88caee7a0"},
-    {file = "coverage-5.0.3-cp36-cp36m-macosx_10_13_x86_64.whl", hash = "sha256:b26aaf69713e5674efbde4d728fb7124e429c9466aeaf5f4a7e9e699b12c9fe2"},
-    {file = "coverage-5.0.3-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:722e4557c8039aad9592c6a4213db75da08c2cd9945320220634f637251c3894"},
-    {file = "coverage-5.0.3-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:7afad9835e7a651d3551eab18cbc0fdb888f0a6136169fbef0662d9cdc9987cf"},
-    {file = "coverage-5.0.3-cp36-cp36m-win32.whl", hash = "sha256:25dbf1110d70bab68a74b4b9d74f30e99b177cde3388e07cc7272f2168bd1477"},
-    {file = "coverage-5.0.3-cp36-cp36m-win_amd64.whl", hash = "sha256:c312e57847db2526bc92b9bfa78266bfbaabac3fdcd751df4d062cd4c23e46dc"},
-    {file = "coverage-5.0.3-cp37-cp37m-macosx_10_13_x86_64.whl", hash = "sha256:a8b8ac7876bc3598e43e2603f772d2353d9931709345ad6c1149009fd1bc81b8"},
-    {file = "coverage-5.0.3-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:527b4f316e6bf7755082a783726da20671a0cc388b786a64417780b90565b987"},
-    {file = "coverage-5.0.3-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:d649dc0bcace6fcdb446ae02b98798a856593b19b637c1b9af8edadf2b150bea"},
-    {file = "coverage-5.0.3-cp37-cp37m-win32.whl", hash = "sha256:cd60f507c125ac0ad83f05803063bed27e50fa903b9c2cfee3f8a6867ca600fc"},
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 ]
 tox = [
     {file = "tox-3.12.1-py2.py3-none-any.whl", hash = "sha256:f5c8e446b51edd2ea97df31d4ded8c8b72e7d6c619519da6bb6084b9dd5770f9"},
     {file = "tox-3.12.1.tar.gz", hash = "sha256:f87fd33892a2df0950e5e034def9468988b8d008c7e9416be665fcc0dd45b14f"},
-    {file = "tox-3.14.5-py2.py3-none-any.whl", hash = "sha256:0cbe98369081fa16bd6f1163d3d0b2a62afa29d402ccfad2bd09fb2668be0956"},
-    {file = "tox-3.14.5.tar.gz", hash = "sha256:676f1e3e7de245ad870f956436b84ea226210587d1f72c8dfb8cd5ac7b6f0e70"},
+    {file = "tox-3.14.6-py2.py3-none-any.whl", hash = "sha256:b2c4b91c975ea5c11463d9ca00bebf82654439c5df0f614807b9bdec62cc9471"},
+    {file = "tox-3.14.6.tar.gz", hash = "sha256:a4a6689045d93c208d77230853b28058b7513f5123647b67bf012f82fa168303"},
 ]
 typed-ast = [
     {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3"},
@@ -2129,9 +2244,9 @@ typing = [
     {file = "typing-3.7.4.1.tar.gz", hash = "sha256:91dfe6f3f706ee8cc32d38edbbf304e9b7583fb37108fef38229617f8b3eba23"},
 ]
 typing-extensions = [
-    {file = "typing_extensions-3.7.4.1-py2-none-any.whl", hash = "sha256:910f4656f54de5993ad9304959ce9bb903f90aadc7c67a0bef07e678014e892d"},
-    {file = "typing_extensions-3.7.4.1-py3-none-any.whl", hash = "sha256:cf8b63fedea4d89bab840ecbb93e75578af28f76f66c35889bd7065f5af88575"},
-    {file = "typing_extensions-3.7.4.1.tar.gz", hash = "sha256:091ecc894d5e908ac75209f10d5b4f118fbdb2eb1ede6a63544054bb1edb41f2"},
+    {file = "typing_extensions-3.7.4.2-py2-none-any.whl", hash = "sha256:f8d2bd89d25bc39dabe7d23df520442fa1d8969b82544370e03d88b5a591c392"},
+    {file = "typing_extensions-3.7.4.2-py3-none-any.whl", hash = "sha256:6e95524d8a547a91e08f404ae485bbb71962de46967e1b71a0cb89af24e761c5"},
+    {file = "typing_extensions-3.7.4.2.tar.gz", hash = "sha256:79ee589a3caca649a9bfd2a8de4709837400dfa00b6cc81962a1e6a1815969ae"},
 ]
 urllib3 = [
     {file = "urllib3-1.24.3-py2.py3-none-any.whl", hash = "sha256:a637e5fae88995b256e3409dc4d52c2e2e0ba32c42a6365fee8bbd2238de3cfb"},
@@ -2142,12 +2257,12 @@ urllib3 = [
 virtualenv = [
     {file = "virtualenv-16.7.10-py2.py3-none-any.whl", hash = "sha256:105893c8dc66b7817691c7371439ec18e3b6c5e323a304b5ed96cdd2e75cc1ec"},
     {file = "virtualenv-16.7.10.tar.gz", hash = "sha256:e88fdcb08b0ecb11da97868f463dd06275923f50d87f4b9c8b2fc0994eec40f4"},
-    {file = "virtualenv-20.0.7-py2.py3-none-any.whl", hash = "sha256:30ea90b21dabd11da5f509710ad3be2ae47d40ccbc717dfdd2efe4367c10f598"},
-    {file = "virtualenv-20.0.7.tar.gz", hash = "sha256:4a36a96d785428278edd389d9c36d763c5755844beb7509279194647b1ef47f1"},
+    {file = "virtualenv-20.0.17-py2.py3-none-any.whl", hash = "sha256:00cfe8605fb97f5a59d52baab78e6070e72c12ca64f51151695407cc0eb8a431"},
+    {file = "virtualenv-20.0.17.tar.gz", hash = "sha256:c8364ec469084046c779c9a11ae6340094e8a0bf1d844330fc55c1cefe67c172"},
 ]
 wcwidth = [
-    {file = "wcwidth-0.1.8-py2.py3-none-any.whl", hash = "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603"},
-    {file = "wcwidth-0.1.8.tar.gz", hash = "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"},
+    {file = "wcwidth-0.1.9-py2.py3-none-any.whl", hash = "sha256:cafe2186b3c009a04067022ce1dcd79cb38d8d65ee4f4791b8888d6599d1bbe1"},
+    {file = "wcwidth-0.1.9.tar.gz", hash = "sha256:ee73862862a156bf77ff92b09034fc4825dd3af9cf81bc5b360668d425f3c5f1"},
 ]
 webencodings = [
     {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
diff --git a/poetry/installation/pip_installer.py b/poetry/installation/pip_installer.py
index aada0cd0190..5a3e8df7852 100644
--- a/poetry/installation/pip_installer.py
+++ b/poetry/installation/pip_installer.py
@@ -105,12 +105,6 @@ def update(self, package, target):
         self.install(target, update=True)
 
     def remove(self, package):
-        # If we have a VCS package, remove its source directory
-        if package.source_type == "git":
-            src_dir = self._env.path / "src" / package.name
-            if src_dir.exists():
-                safe_rmtree(str(src_dir))
-
         try:
             self.run("uninstall", package.name, "-y")
         except CalledProcessError as e:
@@ -119,6 +113,17 @@ def remove(self, package):
 
             raise
 
+        # This is a workaround for https://github.com/pypa/pip/issues/4176
+        nspkg_pth_file = self._env.site_packages / "{}-nspkg.pth".format(package.name)
+        if nspkg_pth_file.exists():
+            nspkg_pth_file.unlink()
+
+        # If we have a VCS package, remove its source directory
+        if package.source_type == "git":
+            src_dir = self._env.path / "src" / package.name
+            if src_dir.exists():
+                safe_rmtree(str(src_dir))
+
     def run(self, *args, **kwargs):  # type: (...) -> str
         return self._env.run_pip(*args, **kwargs)
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 8386ad35f57..7cda645c303 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -11,6 +11,8 @@
 from poetry.config.config import Config as BaseConfig
 from poetry.config.dict_config_source import DictConfigSource
 from poetry.utils._compat import Path
+from poetry.utils.env import EnvManager
+from poetry.utils.env import VirtualEnv
 from tests.helpers import mock_clone
 from tests.helpers import mock_download
 
@@ -122,3 +124,15 @@ def tmp_dir():
     yield dir_
 
     shutil.rmtree(dir_)
+
+
+@pytest.fixture
+def tmp_venv(tmp_dir):
+    venv_path = Path(tmp_dir) / "venv"
+
+    EnvManager.build_venv(str(venv_path))
+
+    venv = VirtualEnv(venv_path)
+    yield venv
+
+    shutil.rmtree(str(venv.path))
diff --git a/tests/fixtures/git/github.com/demo/namespace-package-one/namespace_package/__init__.py b/tests/fixtures/git/github.com/demo/namespace-package-one/namespace_package/__init__.py
new file mode 100644
index 00000000000..5284146ebf2
--- /dev/null
+++ b/tests/fixtures/git/github.com/demo/namespace-package-one/namespace_package/__init__.py
@@ -0,0 +1 @@
+__import__("pkg_resources").declare_namespace(__name__)
diff --git a/tests/fixtures/git/github.com/demo/namespace-package-one/namespace_package/one/__init__.py b/tests/fixtures/git/github.com/demo/namespace-package-one/namespace_package/one/__init__.py
new file mode 100644
index 00000000000..1ac9243c76f
--- /dev/null
+++ b/tests/fixtures/git/github.com/demo/namespace-package-one/namespace_package/one/__init__.py
@@ -0,0 +1 @@
+name = "one"
diff --git a/tests/fixtures/git/github.com/demo/namespace-package-one/setup.py b/tests/fixtures/git/github.com/demo/namespace-package-one/setup.py
new file mode 100644
index 00000000000..871fae6cf69
--- /dev/null
+++ b/tests/fixtures/git/github.com/demo/namespace-package-one/setup.py
@@ -0,0 +1,15 @@
+from setuptools import setup, find_packages
+
+
+setup(
+    name="namespace_package_one",
+    version="1.0.0",
+    description="",
+    long_description="",
+    author="Python Poetry",
+    author_email="noreply@python-poetry.org",
+    license="MIT",
+    packages=find_packages(),
+    namespace_packages=["namespace_package"],
+    zip_safe=False,
+)
diff --git a/tests/installation/test_pip_installer.py b/tests/installation/test_pip_installer.py
index fe40328aa1a..702dfe9c0e6 100644
--- a/tests/installation/test_pip_installer.py
+++ b/tests/installation/test_pip_installer.py
@@ -1,3 +1,5 @@
+import shutil
+
 import pytest
 
 from poetry.installation.pip_installer import PipInstaller
@@ -152,3 +154,42 @@ def test_requirement_git_develop_true(installer, package_git):
     expected = ["-e", "git+git@github.com:demo/demo.git@master#egg=demo"]
 
     assert expected == result
+
+
+def test_uninstall_git_package_nspkg_pth_cleanup(mocker, tmp_venv, pool):
+    # this test scenario requires a real installation using the pip installer
+    installer = PipInstaller(tmp_venv, NullIO(), pool)
+
+    # use a namepspace package
+    package = Package("namespace-package-one", "1.0.0")
+    package.source_type = "git"
+    package.source_url = "https://github.com/demo/namespace-package-one.git"
+    package.source_reference = "master"
+    package.develop = True
+
+    # we do this here because the virtual env might not be usable if failure case is triggered
+    pth_file_candidate = tmp_venv.site_packages / "{}-nspkg.pth".format(package.name)
+
+    # in order to reproduce the scenario where the git source is removed prior to proper
+    # clean up of nspkg.pth file, we need to make sure the fixture is copied and not
+    # symlinked into the git src directory
+    def copy_only(source, dest):
+        if dest.exists():
+            dest.unlink()
+
+        if source.is_dir():
+            shutil.copytree(str(source), str(dest))
+        else:
+            shutil.copyfile(str(source), str(dest))
+
+    mocker.patch("tests.helpers.copy_or_symlink", new=copy_only)
+
+    # install package and then remove it
+    installer.install(package)
+    installer.remove(package)
+
+    assert not Path(pth_file_candidate).exists()
+
+    # any command in the virtual environment should trigger the error message
+    output = tmp_venv.run("python", "-m", "site")
+    assert "Error processing line 1 of {}".format(pth_file_candidate) not in output
diff --git a/tests/utils/test_env.py b/tests/utils/test_env.py
index e5926e68862..9ed47c87b56 100644
--- a/tests/utils/test_env.py
+++ b/tests/utils/test_env.py
@@ -60,18 +60,6 @@ def manager(poetry):
     return EnvManager(poetry)
 
 
-@pytest.fixture
-def tmp_venv(tmp_dir, manager):
-    venv_path = Path(tmp_dir) / "venv"
-
-    manager.build_venv(str(venv_path))
-
-    venv = VirtualEnv(venv_path)
-    yield venv
-
-    shutil.rmtree(str(venv.path))
-
-
 def test_virtualenvs_with_spaces_in_their_path_work_as_expected(tmp_dir, manager):
     venv_path = Path(tmp_dir) / "Virtual Env"