Pullkin

Change
* `message` may be `None`

Add
* `app_data_example_value = data_message.app_data["example"]`
* `"example" in data_message.app_data`
* `app_data: dict[str, Any] = data_message.app_data.to_dict()`

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.13.0...v0.14.0

Change
* dataclasses -> pydantic
* Explicitly specify applications to receive push notifications

Fix
* Fix tests
* Up dependencies

Fix

* Auto detect multiple apps credentials detect

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.12.0...v0.12.1

Change
* Now set credentials to `.run(timer, sender_id, credentials, persistent_id)` or `.listen_coroutine(sender_id, credentials, persistent_id)`

Remove
* `Pullkin.credentials` and `Pullkin.persistent_ids`

**Full Changelog**: https://github.com/WhiteApfel/Pullkin/compare/v0.11.2...v0.12.0

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


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