App Store "Revoke" notification

[kiritokatklian]

Hello @imdhemy. First of all great work on this package!

So I have come across a new notification type from the App Store which doesn't seem to be handled by this package.
This is how Apple describes it.

REVOKE

Indicates that an in-app purchase the user was entitled to through Family Sharing is no longer available through sharing.

It would be nice to support this in an upcoming update.

[imdhemy]

@kiritokatklian
Great, I'm gonna implement it ASAP. Thank you!