Publish 3.0.0-nullsafety.0

[cbenhagen]

It would be awesome if this package could be migrated to null safety.

[filippov-au]

Actually it is migrated:
#76

It needs to be published may be?

[cbenhagen]

Oh indeed, even by the Flutter product manager. Sorry I missed that. Yes then it would only need to be published.

[simc]

Done

[IchordeDionysos]

@leisim it's now published as a pre-release version for more than 2 months.

Do you feel confident yet to publish this as a stable version?

[carlosfiori]

Is the pre-release version stable?

[nohli]

@carlosfiori I'm using it in production apps and there has been absolutely no problem.

Maybe @leisim could publish a stable version?

[BringTheChill]

@leisim any news?