update readme

Author: smallprogram

docs/README.md

@@ -19,7 +19,7 @@
 </div>
 
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-[![中文文档](https://img.shields.io/badge/语言-简体中文-blue?style=for-the-badge)](README_CN.md)  [![English Docs](https://img.shields.io/badge/Language-English-green?style=for-the-badge)](README.md)
+[![中文文档](https://img.shields.io/badge/语言-简体中文-blue?style=for-the-badge)](README_CN.md)  [![English Docs](https://img.shields.io/badge/Language-English-green?style=for-the-badge)](README.md)   [![SNAPSHOT](https://img.shields.io/badge/Openwrt_Immortalwrt-Snapshot_release_link-green?style=for-the-badge)](https://github.com/0x533512/OpenWrtAction-snapshot/releases)
 
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docs/README_CN.md

@@ -20,6 +20,7 @@
 
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 [![中文文档](https://img.shields.io/badge/语言-简体中文-blue?style=for-the-badge)](README_CN.md)  [![English Docs](https://img.shields.io/badge/Language-English-green?style=for-the-badge)](README.md)
+  [![SNAPSHOT](https://img.shields.io/badge/Openwrt_Immortalwrt-Snapshot_release_link-green?style=for-the-badge)](https://github.com/0x533512/OpenWrtAction-snapshot/releases)
 
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