Bring `tox.ini` up to date with `setup.py` and `.travis.yml`.
@@ -1,5 +1,5 @@
[tox]
envlist = pypy,py26,py27,py33,py34
envlist = pypy,py26,py27,py33,py34,py35,py36
[testenv]
whitelist_externals = git
setenv =
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