update demo

Author: dujiepeng

example/lib/main.dart

@@ -16,7 +16,7 @@ class MyApp extends StatelessWidget {
       theme: ThemeData(
         primarySwatch: Colors.blue,
       ),
-      home: const MyHomePage(title: 'Agora Flutter SDK Demo'),
+      home: const MyHomePage(title: 'Flutter SDK Demo'),
     );
   }
 }