Add gitter badge to readme

Author: benbellheron

README.md

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+[![Gitter chat](https://badges.gitter.im/adeptRL.png)](https://gitter.im/adeptRL/Lobby)
 # adept
 
 adept is a library designed to accelerate reinforcement learning research by providing:
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 ## Acknowledgements
 We borrow pieces of OpenAI's [gym](https://github.com/openai/gym) and [baselines](https://github.com/openai/baselines) code.
-We indicate where this is done.
+We indicate where this is done.