disposable_utils 1.3.0

Provides a mechanism for releasing resources and utils for Dart and Flutter

##[1.3.0] Added null safety support. Updated tests

[1.2.0]

Added equality comparison and hashcode function to disposable. Added toDisposable(void Function(T)) to convert from any object toDisposable of streams and stream controllers removed to asDisposable() Changed Disposable factory function to Disposable.create()

[1.0.0]

First release. Added Disposable, DisposableCollector and extension methods