Prepare for Python 3.7. Related #23 (#24)

Author: penguinolog

.travis.yml

@@ -8,6 +8,7 @@ python:
 - &mainstream_python 3.6
 - &pypy pypy
 - pypy3.5
+- 3.7-dev
 install:
 - &upgrade_python_toolset pip install --upgrade pip setuptools wheel
 - pip install tox-travis

README.rst

@@ -46,6 +46,7 @@ Pros:
     Python 3.4
     Python 3.5
     Python 3.6
+    Python 3.7
     PyPy
     PyPy3 3.5+
 

tox.ini

@@ -5,7 +5,7 @@
 
 [tox]
 minversion = 2.0
-envlist = pep8, pep257, py{27,34,35,36,py,py3}, pylint, bandit, py{34,35,36}-nocov, docs,
+envlist = pep8, pep257, py{27,34,35,36,37,py,py3}, pylint, bandit, py{34,35,36}-nocov, docs,
 skipsdist = True
 skip_missing_interpreters = True
 
@@ -57,6 +57,7 @@ commands = {posargs:}
 3.4 = py34,
 3.5 = py35,
 3.6 = py36,
+3.7 = py37,
 pypy = install, pypy,
 pypy3 = install, pypy3,