Update sphinx from 1.5.5 to 1.5.6 (#41)

pyup-bot · tony · commit 371a81dd8b77 · 2017-05-14T19:49:11.000-05:00
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==1.5.5
+sphinx==1.5.6
 alabaster==0.7.10
