Merge pull request #297 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

README.md

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 ##Redisson - distributed and scalable Java data structures on top of Redis server. Advanced Java Redis client
 
+[![Join the chat at https://gitter.im/mrniko/redisson](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mrniko/redisson?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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 Use familiar Java data structures with power of [Redis](http://redis.io).
 
 Based on high-performance async and lock-free Java Redis client and [Netty 4](http://netty.io) framework.