Update readme

README.md

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 # Mint UI
 
-[![Build Status](https://travis-ci.org/ElemeFE/mint-ui.svg?branch=next)](https://travis-ci.org/ElemeFE/mint-ui)
+[![Build Status](https://travis-ci.org/ElemeFE/mint-ui.svg?branch=master)](https://travis-ci.org/ElemeFE/mint-ui)
 [![npm](https://img.shields.io/npm/v/mint-ui.svg?maxAge=3600)](https://www.npmjs.com/package/mint-ui)
 [![NPM downloads](http://img.shields.io/npm/dm/mint-ui.svg)](https://npmjs.org/package/mint-ui)
-![JS gzip size](http://img.badgesize.io/elemefe/mint-ui/next/lib/index.js.svg?compression=gzip&label=gzip%20size:%20JS)
-![CSS gzip size](http://img.badgesize.io/elemefe/mint-ui/next/lib/style.css.svg?compression=gzip&label=gzip%20size:%20CSS)
+![JS gzip size](http://img.badgesize.io/elemefe/mint-ui/master/lib/index.js.svg?compression=gzip&label=gzip%20size:%20JS)
+![CSS gzip size](http://img.badgesize.io/elemefe/mint-ui/master/lib/style.css.svg?compression=gzip&label=gzip%20size:%20CSS)
 [![Join the chat at https://gitter.im/ElemeFE/mint-ui](https://badges.gitter.im/ElemeFE/mint-ui.svg)](https://gitter.im/ElemeFE/mint-ui?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 > Mobile UI elements for **Vue 2.0**