Update README.md

README.md

@@ -24,9 +24,10 @@ Java 开发人员手册
 	- [git 常用指令](./gitcmd.md)  /  [git 官方中文教程](https://git-scm.com/book/zh/v2) 
 	
 + 开发
-   - [Java 开发](./dev/java/)
-	- [maven 命令](./dev/java/maven/mavencmd.md) / [maven仓库配置](./dev/java/maven/maven_setting.xml)
-	- 日志: [logback](./dev/java/logback/logback.md)
+	- [Java 开发](./dev/java/)
+		+ [maven 命令](./dev/java/maven/mavencmd.md) / [maven仓库配置](./dev/java/maven/maven_setting.xml)
+		+ 日志: [logback](./dev/java/logback/logback.md)
+	
    - [Mysql](./dev/mysql/)
 
 ### 2.4 面试相关