Exception when startin RateMyApp for native ratings

[Arcturus5404]

Describe the bug
When calling the showRateDialog method with ignoreNativeDialog: false, an exception is being thrown:

E/flutter ( 6167): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: type 'Future<bool?>' is not a subtype of type 'FutureOr' in type cast
E/flutter ( 6167): #0 RateMyApp.showRateDialog (package:rate_my_app/src/core.dart:128:46)
E/flutter ( 6167): #1 _StartScreenState._showRateMyApp (package:paintmaster/screens/start_screen.dart:342:24)
E/flutter ( 6167): #2 _StartScreenState.initState. (package:paintmaster/screens/start_screen.dart:335:9)
E/flutter ( 6167):

To Reproduce
Steps to reproduce the behavior:

1. Call the method, see an exception

Expected behavior
No exceptions, I am not sure if the rate dialog works right now

Screenshots
The app runs fine though

[Arcturus5404]

I think the fix is simple. The as Future<bool> should be Future<bool?>

[Skyost]

You're right, thanks for reporting !