dev3.x分支的example无法运行

[v423]

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Warning
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Your Flutter application is created using an older version of the Android
embedding. It is being deprecated in favor of Android embedding v2. To migrate
your project, follow the steps at:

https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects

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The detected reason was:

/Users/hanland/Desktop/jpush-flutter-plugin/example/android/app/src/main/AndroidManifest.xml uses android:name="io.flutter.app.FlutterApplication"
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