Update README.md

Author: TommyLemon

README.md

@@ -17,7 +17,7 @@ This source code is licensed under the Apache License Version 2.0 <br/>
   <a href="https://github.com/APIJSON/APIJSON-Demo/tree/master/MySQL"><img src="https://img.shields.io/badge/TiDB-2.1%2B-brightgreen.svg?style=flat"></a>
 </p>
 <p align="center" >
-  <a href="https://github.com/APIJSON/APIJSON-Demo/tree/master/APIJSON-Java-Server"><img src="https://img.shields.io/badge/Java-1.7%2B-brightgreen.svg?style=flat"></a>
+  <a href="https://github.com/APIJSON/APIJSON-Demo/tree/master/APIJSON-Java-Server"><img src="https://img.shields.io/badge/Java-1.8%2B-brightgreen.svg?style=flat"></a>
   <a href="https://github.com/liaozb/APIJSON.NET"><img src="https://img.shields.io/badge/CSharp-2.1%2B-brightgreen.svg?style=flat"></a>
   <a href="https://github.com/qq547057827/apijson-php"><img src="https://img.shields.io/badge/PHP-7.0%2B-brightgreen.svg?style=flat"></a>
   <a href="https://github.com/kevinaskin/apijson-node"><img src="https://img.shields.io/badge/Node.js-ES6%2B-brightgreen.svg?style=flat"></a>