Migrates to null safety

[alanlanglois]

One of the only left library I'm using not yet null safety ready.
Here are some info on how to migrate:
https://www.youtube.com/watch?v=eBr5tlumwlg
or
https://medium.com/dartlang/preparing-the-dart-and-flutter-ecosystem-for-null-safety-e550ce72c010

[pdliuw]

我正在使用的仅有的左侧库之一尚未准备好安全性。
以下是一些有关迁移的信息：
https : //www.youtube.com/watch?v=eBr5tlumwlg
或
https://medium.com/dartlang/preparing-the-dart-and-flutter-ecosystem-for-null -安全-e550ce72c010

Thank you very much for your attention

We will improve it as soon as possible

Thank you very much.

[Elendiar]

We will improve it as soon as possible

Thanks you for this plugin, but when nullsafety update released ?

[radvansky-tomas]

@pdliuw I've migrated whole project, platform interface and web implementation to null-safety and flutter 2. I might do some more improvements

[pdliuw]

• Thank you for your help!
• merge Null-safety #26 from @radvansky-tomas ,thank you very much
• null safety #v3.0.0