doc: intro modify

README-zh_CN.md

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 # NutUI 2
 ![npm version](https://img.shields.io/npm/v/@nutui/nutui.svg)  [![Build Status](https://api.travis-ci.org/jdf2e/nutui.svg?branch=master)](https://github.com/jdf2e/nutui/) [![Coverage Status](https://coveralls.io/repos/github/jdf2e/nutui/badge.svg?branch=master)](https://coveralls.io/github/jdf2e/nutui?branch=master) ![license](https://img.shields.io/npm/l/@nutui/nutui.svg)
  
-一套移动端轻量级Vue组件库
+一套移动端轻量级组件库
     
 ![NutUI](https://img11.360buyimg.com/uba/jfs/t1/11117/21/3608/18942/5c20ab52E35e5a500/02e3c1f89cd3dad1.png)
 

README.md

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 # NutUI 2
 ![npm version](https://img.shields.io/npm/v/@nutui/nutui.svg)  [![Build Status](https://api.travis-ci.org/jdf2e/nutui.svg?branch=master)](https://github.com/jdf2e/nutui/) [![Coverage Status](https://coveralls.io/repos/github/jdf2e/nutui/badge.svg?branch=master)](https://coveralls.io/github/jdf2e/nutui?branch=master) ![license](https://img.shields.io/npm/l/@nutui/nutui.svg)
  
-A light mobile Toolkit based on Vue
+A light mobile Toolkit
     
 ![NutUI](https://img11.360buyimg.com/uba/jfs/t1/11117/21/3608/18942/5c20ab52E35e5a500/02e3c1f89cd3dad1.png)
 

docs/intro.md

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 # NutUI
 
-NutUI是一套京东风格的移动端Vue组件库，开发和服务于移动Web界面的企业级前中后台产品。
+NutUI是一套京东风格的移动端组件库，开发和服务于移动Web界面的企业级前中后台产品。
 
 <div style="margin:30px 0;">
     <img src="http://img14.360buyimg.com/uba/jfs/t1/8543/6/11560/22014/5c2c6136E8023ac0a/6abbd9de10999c48.png" width="150" alt="NutUI">