Update README.md

Author: TommyLemon

README.md

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+<p align="center" >
+  <img src="https://raw.githubusercontent.com/TommyLemon/APIJSON/master/logo.png" />
+</p>
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 <h1 align="center" style="text-align:center;">
   APIJSON
 </h1>
 
 
 <p align="center">🚀后端接口和文档自动化，前端(客户端) 定制返回JSON的数据和结构！</p>
-<p align="center" >
-  <img src="https://raw.githubusercontent.com/TommyLemon/APIJSON/master/logo.png" />
-</p>
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 <p align="center" >
   <a href="https://github.com/TommyLemon/APIJSON/tree/master/MySQL"><img src="https://img.shields.io/badge/MySQL-5.7%2B-brightgreen.svg?style=flat"></a>
   <a href="https://github.com/TommyLemon/APIJSON/tree/master/PostgreSQL"><img src="https://img.shields.io/badge/PostgreSQL-9.5%2B-brightgreen.svg?style=flat"></a>