Description
The rpush init rake task generates a default initializer for Rpush that includes sample code for various reflections. However, I believe some of these reflections are outdated and may have been removed in previous releases of the gem.

I just refactored the Rpush configuration of our apps and it took me a while to figure out that a couple of previously used reflections are not supported any more.

Suggestion
I can offer to remove the stale reflections from the code base and create a PR to:

• cleanup the template for the Rails initializer (lib/generators/templates/rpush.rb)
• cleanup the file lib/rpush/reflection_collection.rb
• cleanup the README.md

Examples

[apns_feedback]
It seems like this reflection is no longer used. Instead, APNS apps use the reflection notification_id_failed in case of errors / stale device_tokens.

[fcm_canonical_id]
It seems like the reflection fcm_canonical_id is no longer invoked in the codebase.