Support for dart 3.0 null-safety

[thomasschwarzott]

I was just about to open this issue, too as I'm getting an error concerning the depending version of path_provider. I'll just add the error when trying to update my pubspec.yaml :)

Because localstorage 3.0.6+9 depends on path_provider ^1.6.14 and no versions of localstorage match >3.0.6+9 <4.0.0, localstorage ^3.0.6+9 requires path_provider ^1.6.14.

So, because [package_name] depends on both localstorage ^3.0.6+9 and path_provider ^2.0.1, version solving failed.

[Ali-Fadaei]

@thomasschwarzott change path_provider ^1.6.14 to path_provider: ^2.0.1 manually! it's working

[thomasschwarzott]

@Ali-Fadaei indeed - but the package should be up to date and working automatically on install :)

Edit: there is actually a pull request already: https://github.com/lesnitsky/flutter_localstorage/pull/66

[tcd93]

Oops didn't see #66

I refactored to dart 2, did some preliminary checks and seems to work, guys please help test #70 thanks

[adamontherun]

been using #70 for a few days and it works great @tcd93 @lesnitsky