Add support for Python 3.6.

Additionally:
- add flake8 check (with currently many issues displayed)
- check for coverage (does not work well because subprocesses are used in the test runs)

.coveragerc

@@ -0,0 +1,6 @@
+[run]
+branch = True
+source = plone.recipe.zope2instance
+
+[report]
+precision = 2

.gitignore

@@ -11,4 +11,8 @@ include/
 lib/
 parts
 pip-selfcheck.json
+/.coverage
 /.installed.cfg
+/.tox
+/coverage.xml
+/htmlcov

.travis.yml

@@ -2,6 +2,7 @@ language: python
 python:
   - 2.7
   - 3.5
+  - 3.6
 install:
   - pip install setuptools==33.1.1 zc.buildout==2.5.3
   - buildout bootstrap

CHANGES.rst

@@ -8,15 +8,15 @@ Breaking changes:
 
 - Require at least ZODB 5 and Zope 4.0b1.
 
-
-- Python 3 compatibility.
 - Drop support for Plone 4.3 and 5.0.
 
 New features:
 
 - Add wsgi support
   [tschorr]
 
+- Add support for Python 3.5 and 3.6.
+
 Bug fixes:
 
 - Python 3 compatibility with sixer

setup.py

@@ -22,12 +22,13 @@
         "Framework :: Buildout",
         "Framework :: Plone",
         "Framework :: Plone :: 5.1",
-        "Framework :: Zope2",
+        "Framework :: Zope :: 4",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: Implementation :: CPython",
     ],
     packages=find_packages('src'),

tox.ini

@@ -0,0 +1,39 @@
+[tox]
+envlist =
+    flake8,
+    py27,
+    py35,
+    py36,
+    coverage,
+
+skip_missing_interpreters = False
+
+[testenv]
+commands =
+    {envbindir}/buildout -c {toxinidir}/buildout.cfg buildout:directory={envdir} buildout:develop={toxinidir} bootstrap
+    {envbindir}/buildout -c {toxinidir}/buildout.cfg buildout:directory={envdir} buildout:develop={toxinidir} -n install test
+    coverage run {envbindir}/test --all {posargs:-vc}
+skip_install = true
+deps =
+    setuptools==33.1.1
+    zc.buildout
+    coverage
+setenv =
+    COVERAGE_FILE=.coverage.{envname}
+
+[testenv:coverage]
+basepython = python2.7
+deps = coverage
+setenv =
+    COVERAGE_FILE=.coverage
+commands =
+    coverage erase
+    coverage combine
+    coverage html
+    coverage xml
+    coverage report
+
+[testenv:flake8]
+basepython = python2.7
+deps = flake8
+commands = flake8 --doctests src setup.py