Pullkin

Change
* message (first) callback argument can be `None`


**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.11.1...v0.11.2#

Change
* `dict` -> dataclass models for register steps

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.11.0...v0.11.1

Add
* Firebase installation api to `Pullkin.register()` pipeline

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.10.2...v0.11.0

Add
* Add `app_name` arg to `Pullkin.register(sender_id, app_id, app_name)`

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.10.1...v0.10.2

Changes
* Improve `AppCredentials` init and return in `Pullkin.register()`

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.10.0...v0.10.1

Changes
* `AioPullkin` -> `Pullkin`
* Register is async now: `await Pullkin.register(sender_id=..., app_id=...)`

Add
* `app_id` (GCM) arg to `Pullkin.register(sender_id=..., app_id=...)`

Remove
* Sync Pullkin client
* First handler arg `obj`, now: `my_handler(message, data_message)`

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.9.0...v0.10.0