Fix typo in sphinx command

sigmavirus24 · sigmavirus24 · commit 318eef3ee491 · 2015-10-30T22:34:21.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,4 +4,4 @@ install: pip install sphinx
 script: 
 - make doctest
 - make html
-- sphinx -E -c docs -b html docs docs/_build/html
+- sphinx-build -E -c docs -b html docs docs/_build/html
