Support to null-safety

[higorlapacw]

Hey guys! Thank you for this package. Really helpful. Do you have any plans in migrating to null-safety?
Flutter 2.0.0 is already on stable and it requires null-safety.

Here's a migration guide

[mleonhard]

There is an updated fork of this package with support for null-safety:
https://pub.dev/packages/fk_user_agent

[alexmarkley]

I really appreciate this package, and my app definitely depends on it. I see there is a lot of activity in the pull requests section of this repository, so hopefully the maintainer isn't gone!