Add StackOverflow, Gitter and License badges
.. image:: https://readthedocs.org/projects/cherrypy/badge/?version=latest
:target: http://docs.cherrypy.org/en/latest/?badge=latest
+.. image:: https://img.shields.io/badge/StackOverflow-CherryPy-blue.svg
+ :target: https://stackoverflow.com/questions/tagged/cheroot+or+cherrypy
+
+.. image:: https://img.shields.io/gitter/room/cherrypy/cherrypy.svg
+ :target: https://gitter.im/cherrypy/cherrypy
+
.. image:: https://img.shields.io/travis/cherrypy/cherrypy/master.svg?label=Linux%20build%20%40%20Travis%20CI
:target: http://travis-ci.org/cherrypy/cherrypy
.. image:: https://img.shields.io/appveyor/ci/CherryPy/cherrypy/master.svg?label=Windows%20build%20%40%20Appveyor
:target: https://ci.appveyor.com/project/CherryPy/cherrypy/branch/master
+.. image:: https://img.shields.io/badge/license-BSD-blue.svg?maxAge=3600
+ :target: https://pypi.org/project/cheroot
+
.. image:: https://img.shields.io/pypi/pyversions/cherrypy.svg
:target: https://pypi.org/project/cherrypy
