Update README.md

2019-06-06 17:13:01 +08:00
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  </table>
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-## 前言
+## :black_nib: 前  言

 1. [大数据技术栈思维导图](https://github.com/heibaiying/BigData-Notes/blob/master/notes/大数据技术栈思维导图.md)        
 2. [大数据常用软件安装指南](https://github.com/heibaiying/BigData-Notes/blob/master/notes/大数据常用软件安装指南.md)