Update README.md

Author: gorkem-cetin

README.md

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-#Countly [![Build Status](https://api.travis-ci.org/Countly/countly-server.png)](https://travis-ci.org/Countly/countly-server)
+#Countly [![Build Status](https://api.travis-ci.org/Countly/countly-server.png)](https://travis-ci.org/Countly/countly-server) [![Gitter chat](https://badges.gitter.im/CountlyAnalytics/countly-server.png)](https://gitter.im/CountlyAnalytics/countly)
+
 
 **We're hiring:** Countly is looking for developers to work on its core platform. Send us an email (hello at count.ly), including your past experience about Javascript & Node.js, together with Github account name.