update feedback qrcode

README.md

@@ -112,7 +112,7 @@ implementation 'com.kongzue.dialogx:DialogX:0.0.2'
 
 反馈建议可以加讨论群：590498789
 
-<div align=center><img src="https://github.com/kongzue/DialogX/raw/master/readme/feedback_qrcode.png" alt="反馈 DialogX" width="250" height="250" /></div>
+<div align=center><img src="https://github.com/kongzue/DialogX/raw/master/readme/feedback_qq_qrcode.png" alt="反馈 DialogX" width="250" height="250" /></div>
 
 # 开源协议