Enforce Python 3.6 in tox
@@ -14,6 +14,8 @@ setenv =
passenv = CI TRAVIS TRAVIS_*
deps = -r{toxinidir}/requirements/testing.txt
changedir = {toxinidir}/readthedocs
+basepython =
+ python3.6
commands =
/bin/sh -c '\
export DJANGO_SETTINGS_MODULE=readthedocs.settings.test; \
