CI: only install sphinx on py35 build

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.
matplotlib · Jul 8, 2018 · 9c58724 · 9c58724
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commit 9c58724
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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