Upgrade common

humitos · humitos · commit 3b1305ac797f · 2018-08-30T21:58:56.000+02:00
Branch: readthedocs/common#17
diff --git a/common b/common
@@ -1 +1 @@
-Subproject commit 9d653630c7285f8f2ec2deb06cb473e4ad6e0700
+Subproject commit 0568f66fee4e7a6e6a4ecdc194ed58a2ccb57d2b
