Generate code and see suggestion from Dart Team

[kdamsmt]

Hi,

When I use this command by your README in source code

flutter packages pub run build_runner build --delete-conflicting-outputs

Code improvement.

Dart team suggestion not to use underscore. _$actionInfo -> $actionInfo

read here: https://dart-lang.github.io/linter/lints/no_leading_underscores_for_local_identifiers.html