Add support for provider version 6

[zbarbuto]

Allows Provider version 6 to be used in conjunction with Chewie.

Some libraries are starting to update to use v6 of provider (such as flutter_bloc: ^7.2.0) which throws the following error on pub get:

Because no versions of chewie match >1.2.2 <2.0.0 and chewie 1.2.2 depends on provider ^5.0.0, chewie ^1.2.2 requires provider ^5.0.0.
And because flutter_bloc >=7.2.0 depends on provider ^6.0.0, chewie ^1.2.2 is incompatible with flutter_bloc >=7.2.0.

The breaking changes in the provider changelog only talk about optional providers of which Chewie doesn't use any so it should be safe to use provider 6 with chewie. Example app still appears to work as expected with provider v6. Have added <7 to safeguard against breaking changes in future unreleased versions of Provider.

Closes #530

[charlou-aredidon]

This issue is so frustrating. Lots of plugin having the same error.

[diegotori]

@Ahmadre is there any update on this issue, since I too am overriding Provider to 6.0.0 in order to work around this issue.

If you need another person to release updates to this library on your behalf and/or review PRs, then I'll be glad to volunteer. Please reach out to me at [email protected], since I already have a pub.dev account.

[Slaine066]

Guys please take a look at the PR when you find time.
Workarounds are painful.

[diegotori]

@Ahmadre just a gentle reminder that this PR is awaiting approval, merging, and eventual release.

Thank you in advance.

[bhayatus]

@Ahmadre Really hoping this PR can be approved and merged soon, can't upgrade some of our dependencies cause of this single package.

[diegotori]

@Ahmadre can we please get another pub.dev release as a result of this change? Thanks in advance.

[FCView]

@Ahmadre , any chance we can get another pub.dev release for this provider dependency update? I have several conflicts that are starting to arise due to this.

[janhelwich]

@FCView and others interested. You can reference the commit also in your pubspec.yaml like this:

  chewie: #^1.2.2
    git:
      url: https://github.com/brianegan/chewie.git
      ref: b892cb3d4cef0f5f726f97be993e4e0808895489

Not perfect but works until the next version is released.

[imtoori]

could you publish a new release, please?

[CalHoll]

Please release!

[DaemonChoejur]

any news on when 1.2.3 will be released?

[kimmanwky]

@brianegan Please release.