docs: update wx group img

Author: 97vack

README.zh-CN.md

@@ -146,7 +146,7 @@ export default function App() {
 ### <div align="center">加入微信群</div>
 
 <div align="center">
-  <img src="./public/wechat-group.jpg?v=2" alt="wechat-group" width="30%">
+  <img src="./public/wechat-group.jpg?v=3" alt="wechat-group" width="30%">
 </div>
 
 ## 📝 License