Fixed Travis badge to show master branch status

Author: igorprado

README.md

@@ -1,6 +1,6 @@
 # React Notification System
 
-[![npm version](https://badge.fury.io/js/react-notification-system.svg)](http://badge.fury.io/js/react-notification-system) [![npm](https://img.shields.io/npm/dm/react-notification-system.svg)](https://www.npmjs.com/package/react-notification-system) [![Dependency Status](https://david-dm.org/igorprado/react-notification-system.svg)](https://david-dm.org/igorprado/react-notification-system) [![devDependency Status](https://david-dm.org/igorprado/react-notification-system/dev-status.svg)](https://david-dm.org/igorprado/react-notification-system#info=devDependencies) [![Build Status](https://travis-ci.org/igorprado/react-notification-system.svg)](https://travis-ci.org/igorprado/react-notification-system) [![Coverage Status](https://coveralls.io/repos/igorprado/react-notification-system/badge.svg?branch=master&service=github)](https://coveralls.io/github/igorprado/react-notification-system?branch=master)
+[![npm version](https://badge.fury.io/js/react-notification-system.svg)](http://badge.fury.io/js/react-notification-system) [![npm](https://img.shields.io/npm/dm/react-notification-system.svg)](https://www.npmjs.com/package/react-notification-system) [![Dependency Status](https://david-dm.org/igorprado/react-notification-system.svg)](https://david-dm.org/igorprado/react-notification-system) [![devDependency Status](https://david-dm.org/igorprado/react-notification-system/dev-status.svg)](https://david-dm.org/igorprado/react-notification-system#info=devDependencies) [![Build Status](https://travis-ci.org/igorprado/react-notification-system.svg?branch=master)](https://travis-ci.org/igorprado/react-notification-system) [![Coverage Status](https://coveralls.io/repos/igorprado/react-notification-system/badge.svg?branch=master&service=github)](https://coveralls.io/github/igorprado/react-notification-system?branch=master)
 
 > A complete and totally customizable component for notifications in React.