Update for tox

Author: akb

docs/requirements.txt

@@ -1,3 +1,4 @@
 sphinx>=1.3
 sphinx-rtd-theme
+sphinx-autodoc-typehints
 -e .

tox.ini

@@ -5,19 +5,11 @@ envlist =
     clean,
     check,
     docs,
-    {py27,py34,py35,py36,py37,pypy,pypy3},
     report
 
 [testenv]
-basepython =
-    pypy: {env:TOXPYTHON:pypy}
-    pypy3: {env:TOXPYTHON:pypy3}
-    {py27,docs,spell}: {env:TOXPYTHON:python2.7}
-    py34: {env:TOXPYTHON:python3.4}
-    py35: {env:TOXPYTHON:python3.5}
-    py36: {env:TOXPYTHON:python3.6}
-    py37: {env:TOXPYTHON:python3.7}
-    {bootstrap,clean,check,report}: {env:TOXPYTHON:python3}
+basepython = python3.7
+
 setenv =
     PYTHONPATH={toxinidir}/tests
     PYTHONUNBUFFERED=yes
@@ -60,7 +52,7 @@ deps =
     sphinxcontrib-spelling
     pyenchant
 
-[testenv:docs]
+[testenv:doc]
 deps =
     -r{toxinidir}/docs/requirements.txt
 commands =