migrate to null-safety

[NarHakobyan]

Hi guys, I migrated package to null safety, to be honest I think this library is no more maintainable so you can use null safety version directly from git.

flutter_statusbar_manager:
  git:
    url: https://github.com/NarHakobyan/flutter_statusbar_manager
    ref: master

[amitkot]

@NarHakobyan Oops, I missed your PR and created one for this as well.
I will probably close mine.
I suggest limiting the arguments in the library's functions to not accept null values. Adding an link below.
Also, the example app required some change to its Podfile to build.
I advanced the version number and added to the changelog file, which will help the maintainers push the update.

[amitkot]

I think we should not accept null values here

[amitkot]

also here

[amitkot]

also here

[NarHakobyan]

Hi @amitkot, yeah, it's not necessary to have nullable arguments. I have fixed it.

[NarHakobyan]

@amitkot are you still here? :D

[rafaelmaeuer]

@NarHakobyan thanks very much for your PR, I am using it for now unless something else is moving here... Do you have a solution for MissingPluginException(No implementation found for method setStyle on channel flutter_statusbar_manager) when using flutter web?

Edit: I found a solution using kIsWeb and created a PR: NarHakobyan#1

[amitkot]

@NarHakobyan hi, missed your ping (a month ago).
I'm still here, was working on other project. I'm closing my PR now.