Fixes #152: Add discord server

Author: r4fek

README.md

@@ -6,6 +6,7 @@ All tools you need to start your journey with Apache Cassandra and Django Framew
 [![Latest version](https://img.shields.io/pypi/v/django-cassandra-engine.svg "Latest version")](https://pypi.python.org/pypi/django-cassandra-engine/)
 [![CI](https://api.travis-ci.org/r4fek/django-cassandra-engine.svg?branch=master "CI")](https://travis-ci.org/r4fek/django-cassandra-engine)
 
+Discord: https://discord.gg/pxunMGmDNc
 ## Features ##
 
 * integration with latest `python-driver` and optionally `dse-driver` from DataStax