modify README

Author: hy6544

README.md

@@ -141,7 +141,7 @@ You can switch the image bed service in case a certain image bed is not availabl
 
 <del>Currently supported image beds are [**sm.ms**](https://sm.ms/), Ali, [**RuYu**](https://img.rruu.net/), [**Vim-CN**](https://img.vim-cn.com/), [**meet**](https://www.hualigs.cn/), [**Tencent cloud object storage**](https://curl.qcloud.com/empEScHz) (promotional link),[**Qiniu Cloud**](https://www.qiniu.com/).</del>
 
-For a list of supported image beds, see [**Supported Image Bed Services**]().
+For a list of supported image beds, see [**Supported Image Bed Services**](https://github.com/icexmoon/markdown-img#supported-image-bed-services).
 
 - Excute`python -m markdown_img -i ali`
 

README_cn.md

@@ -144,7 +144,7 @@ pip install --upgrade markdown-img-icexmoon
 
 <del>目前支持的图床有[**sm.ms**](https://sm.ms/)、<del>阿里、[**如优**](https://img.rruu.net/)、</del>[**Vim-CN**](https://img.vim-cn.com/)、[**遇见**](https://www.hualigs.cn/)，[**腾讯云对象存储**](https://curl.qcloud.com/empEScHz)（推广链接）、[**七牛云**](https://www.qiniu.com/)、[**又拍云**](https://www.upyun.com/)（计划支持）。</del>
 
-支持的图床列表见[**支持的图床服务**]()。
+支持的图床列表见[**支持的图床服务**](https://github.com/icexmoon/markdown-img/blob/master/README_cn.md#%E6%94%AF%E6%8C%81%E7%9A%84%E5%9B%BE%E5%BA%8A%E6%9C%8D%E5%8A%A1)。
 
 1. 执行`python -m markdown_img -i ali`