数据库新增 DB2 和 ClickHouse 的链接，感谢两位作者

https://github.com/andream7/apijson-db2 
https://github.com/chenyanlann/APIJSONDemo_ClickHouse

Author: TommyLemon

README.md

@@ -14,7 +14,9 @@ This source code is licensed under the Apache License Version 2.0 <br/>
   <a href="https://github.com/APIJSON/APIJSON-Demo/tree/master/PostgreSQL"><img src="https://img.shields.io/badge/PostgreSQL-9.5%2B-brightgreen.svg?style=flat"></a>
   <a href="https://github.com/APIJSON/APIJSON-Demo/tree/master/SQLServer"><img src="https://img.shields.io/badge/SQLServer-2012%2B-brightgreen.svg?style=flat"></a>
   <a href="https://github.com/APIJSON/APIJSON-Demo/tree/master/Oracle"><img src="https://img.shields.io/badge/Oracle-12C%2B-brightgreen.svg?style=flat"></a>
+  <a href="https://github.com/andream7/apijson-db2"><img src="https://img.shields.io/badge/DB2-7.1%2B-brightgreen.svg?style=flat"></a>
   <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>
+  <a href="https://github.com/chenyanlann/APIJSONDemo_ClickHouse"><img src="https://img.shields.io/badge/ClickHouse-21.1%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-1.8%2B-brightgreen.svg?style=flat"></a>