Added supported Python and Django versions.

Author: hramezani

README.rst

@@ -8,6 +8,12 @@ Django "excontrib" Comments
 .. image:: https://img.shields.io/travis/django/django-contrib-comments.svg
     :target: http://travis-ci.org/django/django-contrib-comments
 
+.. image:: https://img.shields.io/pypi/pyversions/django-contrib-comments.svg
+   :target: https://pypi.python.org/pypi/django-contrib-comments
+
+.. image:: https://img.shields.io/pypi/djversions/django-contrib-comments.svg
+   :target: https://pypi.org/project/django-contrib-comments/
+
 Django used to include a comments framework; since Django 1.6 it's been
 separated to a separate project. This is that project.