Added Gitter badge

README.md

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 [![Build Status](https://secure.travis-ci.org/edubart/otclient.svg?branch=master)](http://travis-ci.org/edubart/otclient)
 ### What is otclient?
 
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 Otclient is an alternative Tibia client for usage with otserv. It aims to be complete and flexible,
 for that it uses LUA scripting for all game interface functionality and configurations files with a syntax
 similar to CSS for the client interface design. Otclient works with a modular system, this means