Update sphinx from 1.5.2 to 1.5.3 (#28)

pyup-bot · tony · commit 934abd96cfed · 2017-02-26T10:25:12.000-06:00
diff --git a/requirements/doc.txt b/requirements/doc.txt
@@ -1,4 +1,4 @@
 docutils==0.13.1
 releases==1.3.0 # updated from 1.2.0
-sphinx==1.5.2
+sphinx==1.5.3
 alabaster==0.7.9
