update travis-ci

Author: troolee

README.md

@@ -1,7 +1,7 @@
 gridstack.js
 ============
 
-[![Build Status](https://travis-ci.org/troolee/gridstack.js.svg?branch=master)](https://travis-ci.org/troolee/gridstack.js)
+[![Build Status](https://travis-ci.org/gridstack/gridstack.js.svg?branch=develop)](https://travis-ci.org/gridstack/gridstack.js)
 [![Coverage Status](https://coveralls.io/repos/github/troolee/gridstack.js/badge.svg?branch=master)](https://coveralls.io/github/troolee/gridstack.js?branch=master)
 [![Dependency Status](https://david-dm.org/troolee/gridstack.js.svg)](https://david-dm.org/troolee/gridstack.js)
 [![devDependency Status](https://david-dm.org/troolee/gridstack.js/dev-status.svg)](https://david-dm.org/troolee/gridstack.js#info=devDependencies)