update readme

README.md

@@ -72,7 +72,7 @@ Java客户端不依赖任何框架，能够运行于所有Java运行时环境，
 
 # Design
   * [Apollo配置中心设计](https://github.com/ctripcorp/apollo/wiki/Apollo%E9%85%8D%E7%BD%AE%E4%B8%AD%E5%BF%83%E8%AE%BE%E8%AE%A1)
-  * [Apollo核心概念之“Namespace”](https://github.com/ctripcorp/apollo/wiki/Apollo%E6%A0%B8%E5%BF%83%E6%A6%82%E5%BF%B5%E4%B9%8B-%E2%80%9CNamespace%E2%80%9D)
+  * [Apollo核心概念之“Namespace”](https://github.com/ctripcorp/apollo/wiki/Apollo%E6%A0%B8%E5%BF%83%E6%A6%82%E5%BF%B5%E4%B9%8B%E2%80%9CNamespace%E2%80%9D)
 
 # Development
   * [Apollo开发指南](https://github.com/ctripcorp/apollo/wiki/Apollo%E5%BC%80%E5%8F%91%E6%8C%87%E5%8D%97)