Show Travis badge for master branch only.

Author: bbrala

README.md

@@ -2,7 +2,7 @@
 
 [![Greenkeeper badge](https://badges.greenkeeper.io/swisnl/jQuery-contextMenu.svg)](https://greenkeeper.io/)
 
-[![Travis](https://img.shields.io/travis/swisnl/jQuery-contextMenu.svg?style=flat-square&maxAge=600)](https://travis-ci.org/swisnl/jQuery-contextMenu) [![npm](https://img.shields.io/npm/v/jquery-contextmenu.svg?style=flat-square&maxAge=600)](https://www.npmjs.com/package/jquery-contextmenu) [![npm](https://img.shields.io/npm/dm/jquery-contextmenu.svg?style=flat-square&maxAge=600)](https://www.npmjs.com/package/jquery-contextmenu) [![Bower](https://img.shields.io/bower/v/jQuery-contextMenu.svg?style=flat-square&maxAge=600)](https://github.com/swisnl/jQuery-contextMenu) [![CDNJS](https://img.shields.io/cdnjs/v/jquery-contextmenu.svg?style=flat-square&maxAge=600)](https://cdnjs.com/libraries/jquery-contextmenu) [![npm](https://img.shields.io/npm/l/jquery-contextmenu.svg?style=flat-square)]()
+[![Travis](https://img.shields.io/travis/swisnl/jQuery-contextMenu/master.svg?style=flat-square&maxAge=600)](https://travis-ci.org/swisnl/jQuery-contextMenu) [![npm](https://img.shields.io/npm/v/jquery-contextmenu.svg?style=flat-square&maxAge=600)](https://www.npmjs.com/package/jquery-contextmenu) [![npm](https://img.shields.io/npm/dm/jquery-contextmenu.svg?style=flat-square&maxAge=600)](https://www.npmjs.com/package/jquery-contextmenu) [![Bower](https://img.shields.io/bower/v/jQuery-contextMenu.svg?style=flat-square&maxAge=600)](https://github.com/swisnl/jQuery-contextMenu) [![CDNJS](https://img.shields.io/cdnjs/v/jquery-contextmenu.svg?style=flat-square&maxAge=600)](https://cdnjs.com/libraries/jquery-contextmenu) [![npm](https://img.shields.io/npm/l/jquery-contextmenu.svg?style=flat-square)]()
 
 $.contextMenu is a management facility for - you guessed it - context menus. It was designed for an application where there are hundreds of elements that may show a context menu - so intialization speed and memory usage are kept fairly small. It also allows to register context menus without providing actual markup, as $.contextMenu generates DOMElements as needed.