Update README.md

Author: viartemev

README.md

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 [![Open Source Helpers](https://www.codetriage.com/viartemev/the-white-rabbit/badges/users.svg)](https://www.codetriage.com/viartemev/the-white-rabbit)
 [![codecov](https://codecov.io/gh/viartemev/the-white-rabbit/branch/master/graph/badge.svg)](https://codecov.io/gh/viartemev/the-white-rabbit)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
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+[![Gitter](https://badges.gitter.im/kotlin-the-white-rabbit/community.svg)](https://gitter.im/kotlin-the-white-rabbit/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
 The White Rabbit is an asynchronous RabbitMQ (AMQP) client based on Kotlin coroutines  
 ### [Benchmarks](https://github.com/viartemev/the-white-rabbit/issues/88#issuecomment-470461937)