Update README.rst
Merge remote-tracking branch 'upstream/master'
Don't push Django messages in CMS plugin.
Disable caching for CMS plugin.

CSRF tokens may get cached otherwise.

This is for compatibility with Django CMS 3.0+.
Add error and success messages to rendering context
Added new template based on as_p.html for Django CMS
Add checkbox to the WIDGET_CLASSES
Update documentation.
Add the missing migration for 55232b275
Local version bump