Update README.md

README.md

@@ -18,14 +18,22 @@
 - [Hibernate Validator](https://github.com/2293736867/SpringBootDemoKotlin/tree/master/HibernateValidator)
 - [Docker部署](https://github.com/2293736867/SpringBootDemoKotlin/tree/master/Docker)
 - [HTTPS](https://github.com/2293736867/SpringBootDemoKotlin/tree/master/HTTPS)
+- [Mail](https://github.com/2293736867/SpringBootDemoKotlin/tree/master/Mail)
 
-# 4 `Java`版`demo`合集
+# 4 `Kotlin`版
+
+- [Github](https://github.com/2293736867/SpringBootDemoKotlin)
+- [码云](https://gitee.com/u6b7b5fc3/SpringBootDemoKotlin)
+- [CODE.CHINA](https://codechina.csdn.net/qq_27525611/SpringBootDemoKotlin)
+
+# 5 `Java`版
 
 - [Github](https://github.com/2293736867/SpringBootDemoJava)
 - [码云](https://gitee.com/u6b7b5fc3/SpringBootDemoJava)
+- [CODE.CHINA](https://codechina.csdn.net/qq_27525611/SpringBootDemoJava)
 
 
-# 5 其他
+# 6 其他
 
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