Update README.md

Add gitter

Author: gfwilliams

README.md

@@ -7,7 +7,8 @@ Espruino JavaScript for Microcontrollers
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-http://www.espruino.com
+http://www.espruino.com &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [![Join the chat at https://gitter.im/espruino/Espruino](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/espruino/Espruino?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 
 About
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