Update README.md

Author: aaPanel

README.md

@@ -88,4 +88,4 @@ bash install_cloudwaf.sh offline
 ##  联系我们
 >1. GitHub Issue 
 >2. WX 二维码
-<img width="239" alt="image" src="https://bt-1251050919.cos.ap-guangzhou.myqcloud.com/btwafGroup.png?a=3">
+<img width="239" alt="image" src="https://bt-1251050919.cos.ap-guangzhou.myqcloud.com/btwafGroup.png?a=4">