fix

修改图片链接

Author: wanwusangzhi

readme.md

@@ -1,5 +1,5 @@
 # Flutter UI
-![https://raw.githubusercontent.com/efoxTeam/flutter-ui/dev-ken/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png](https://raw.githubusercontent.com/efoxTeam/flutter-ui/dev-ken/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png)
+![https://raw.githubusercontent.com/efoxTeam/flutter-ui/master/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png](https://raw.githubusercontent.com/efoxTeam/flutter-ui/master/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png)
 
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