Machine.current is typed as dynamic

[MrGreenTea]

Hi, thanks for this nice library.
It works well for me.

One thing I noticed is that accessing machine.current is typed as dynamic.

I assume this is because in machine.dart
it is defined as

State? get current => _current;

When it probably should be

State<T>? get current => _current;

[renggli]

Thank you for the fix. I'll see what I can do for the setter.