Add Gitter badge

Author: gitter-badger

README.md

@@ -1,4 +1,6 @@
 # Animations
+
+[![Join the chat at https://gitter.im/scratch-css/animations](https://badges.gitter.im/scratch-css/animations.svg)](https://gitter.im/scratch-css/animations?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 Animations library for Scratch users 
 
 [![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg)](https://gitter.im/scratch-css/animations)