如何在flutter上使用Upgrader插件？

dependencies:
  upgrader: ^3.11.1

import 'package:upgrader/upgrader.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('My App'),
        ),
        body: UpgradeAlert(
          child: Center(
            child: Text('Hello World'),
          ),
        ),
      ),
    );
  }
}