Dependency that is currently not opted in to null-safety.

[beliaveu]

environment:
sdk: ">=2.16.1 <3.0.0"

dependencies:
#44 Latest version is without null safety support.
modal_progress_hud: ^0.1.3

[beliaveu]

The library 'package:modal_progress_hud/modal_progress_hud.dart' is legacy, and should not be imported into a null safe library.