Null safety

[jonmountjoy]

Adds null safety, bumps Podfile versions.

This is my best guess at what should happen, after following:
https://dart.dev/null-safety/migration-guide

My ultimate goal is to support https://github.com/fluttercommunity/flutter_sms getting to null safety, and this is a dependency.

[higorlapacw]

Hey, @jonmountjoy, I don't think this repo is accepting PRs. Why don't you upload this fork into pub.dev and mention the work of @j0j00 as inspiration?

[j0j00]

Are all these iOS specific changes part of the null safety work?

I don't have an iOS device to test this on, so just curious if this is the best practice in latest Flutter dev or something.

[j0j00]

Hi @jonmountjoy,

Thanks for the PR.
Apologies for the late response. I don't really do much Flutter dev lately, and this is kind of a burner github account I check in on every once in a while, hence the lack of updates.

I'm pretty happy to make you a co-maintainer if you want as you seem pretty reputable, but from memory, I think there's still a blocker in terms of Flutter publications as only I can publish packages atm, unless an organisation is set up.

I think I might now be able to add new people as uploaders - which I don't think was available last time I checked a couple of months ago.

Only thing missing from the PR is the appropriate changelog.

[jonmountjoy]

Thanks @j0j00 - have now moved to a different library. There's a way, on https://pub.dev/ , to mark your package as deprecated/unsupported - perhaps you can do that?