docs(README): update WeChat group link

- Update WeChat group link in both README.md and README_zh-CN.md

README.md

@@ -41,7 +41,7 @@ Easier to use: Just grab MinerU Desktop. No coding, no login, just a simple inte
 <!-- join us -->
 
 <p align="center">
-    👋 join us on <a href="https://discord.gg/Tdedn9GTXq" target="_blank">Discord</a> and <a href="https://cdn.vansin.top/internlm/mineru.jpg" target="_blank">WeChat</a>
+    👋 join us on <a href="https://discord.gg/Tdedn9GTXq" target="_blank">Discord</a> and <a href="http://mineru.space/s/V85Yl" target="_blank">WeChat</a>
 </p>
 
 </div>

README_zh-CN.md

@@ -40,7 +40,7 @@
 <!-- join us -->
 
 <p align="center">
-    👋 join us on <a href="https://discord.gg/Tdedn9GTXq" target="_blank">Discord</a> and <a href="https://cdn.vansin.top/internlm/mineru.jpg" target="_blank">WeChat</a>
+    👋 join us on <a href="https://discord.gg/Tdedn9GTXq" target="_blank">Discord</a> and <a href="http://mineru.space/s/V85Yl" target="_blank">WeChat</a>
 </p>
 
 </div>