Update deps
Added new rules for Pubspec, Provider, Common, Flutter parts
- Update Dart sdk version to ">=2.14.0 <4.0.0"
- Remove
implicit-casts
Update dependencies
flutter_lints
^2.0.1 -> ^2.0.0
dart_code_metrics
^4.17.0 -> ^5.0.0
Update analysis options from all current projects
Several changes of README
Initial release