Pin sphinx to latest version 1.5.1

pyup-bot · pyup-bot · commit 726fe2029bcd · 2016-12-22T12:48:31.000-06:00
diff --git a/requirements/doc.txt b/requirements/doc.txt
@@ -1,4 +1,4 @@
 docutils==0.12
 releases==1.3.0 # updated from 1.2.0
-sphinx
+sphinx==1.5.1
 alabaster==0.7.9
