Update group.md

group/group.md

@@ -2,4 +2,4 @@
 
 仅供技术交流
 
-<img src = "https://github.com/kailong321200875/my-image/raw/master/chat-0820.jpg" />
+<img src = "https://github.com/kailong321200875/my-image/raw/master/chat-0828.jpg" />