CI: only install sphinx on py35 build

tacaswell · pganssle · commit ab92163d6a80 · 2018-07-08T15:18:41.000-04:00
Sphinx pulls in pytz which we want to avoid to test running without
it.

The sphinx related code is well tested by the circle CI that builds
the docs.
diff --git a/requirements/testing/travis_all.txt b/requirements/testing/travis_all.txt
@@ -15,6 +15,5 @@ pytest-rerunfailures
 pytest-timeout
 pytest-xdist
 python-dateutil
-sphinx
 tornado
 tox
