Remove debug banner

Author: jdeguzman

lib/main.dart

@@ -12,6 +12,7 @@ class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
  return MaterialApp(
  title: 'Flutter Persistence Demo',
+ debugShowCheckedModeBanner: false,
  theme: ThemeData(
  primarySwatch: Colors.blue,
  ),