Bump docutils from 0.12 to 0.16

Bumps [docutils](http://docutils.sourceforge.net/) from 0.12 to 0.16.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

requirements.txt

@@ -17,7 +17,7 @@ django-redis-cache==1.6.5
 django-reversion==1.10.0
 django-taggit==0.19.0
 django-user-accounts==1.3.1
-docutils==0.12
+docutils==0.16
 pinax-eventlog==1.1.0
 gunicorn==19.9.0
 futures==3.3.0