Update README.zh-CN.md

Author: inhere

README.zh-CN.md

@@ -9,7 +9,7 @@
 [![Docker Build Status](https://img.shields.io/docker/build/swoft/swoft.svg)](https://hub.docker.com/r/swoft/swoft/)
 [![Php Version](https://img.shields.io/badge/php-%3E=7.1-brightgreen.svg?maxAge=2592000)](https://secure.php.net/)
 [![Swoole Version](https://img.shields.io/badge/swoole-%3E=4.3.3-brightgreen.svg?maxAge=2592000)](https://github.com/swoole/swoole-src)
-[![Swoft Doc](https://img.shields.io/badge/docs-passing-green.svg?maxAge=2592000)](https://www.swoft.org/docs)
+[![Swoft Doc](https://img.shields.io/badge/docs-passing-green.svg?maxAge=2592000)](https://www.swoft.org)
 [![Swoft License](https://img.shields.io/hexpm/l/plug.svg?maxAge=2592000)](https://github.com/swoft-cloud/swoft/blob/master/LICENSE)
 [![Gitter](https://img.shields.io/gitter/room/swoft-cloud/swoft.svg)](https://gitter.im/swoft-cloud/community)