add gitter badge

Author: mihaileu

README.md

@@ -5,6 +5,8 @@
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/php-amqplib/RabbitMqBundle/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/php-amqplib/RabbitMqBundle/?branch=master)
 [![Code Coverage](https://scrutinizer-ci.com/g/php-amqplib/RabbitMqBundle/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/php-amqplib/RabbitMqBundle/?branch=master)
 [![PHPStan](https://img.shields.io/badge/PHPStan-enabled-brightgreen.svg?style=flat-square)](https://github.com/phpstan/phpstan)
+[![Join the chat at https://gitter.im/php-amqplib/RabbitMqBundle](https://badges.gitter.im/php-amqplib/RabbitMqBundle.svg)](https://gitter.im/php-amqplib/RabbitMqBundle?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 
 ## About ##