GitLab

- removes deprecated APNSBinary Handler
- upgrades to php8.0

Fixed small bugs

Fixed correct payload. Empty json object in body.

Fixed exception FCM handler. Type hinting property $caCertPath. Set default value null.

- fixes an critical issue, where notifications for FCM devices where re-enqueued,
  even if the message was send successfully when a single notification failed to be send
- adds new dummy handler for debugging purposes

- introduces new multi handler pushing for a single message
- refactors APNS handler to use apples 'new' api.push.apple.com API
- improves error handling

- cleanup of docblock comments
- adds @method hints for PushNotification magic __call methods to internal Handlers

- now requires PHP 7.0 at least!
- adds title support for notifications in send() method

- sendRaw() allows to push raw payload without defaults and minimal
  preprocessing to servers

- fixes missing curl_close() in WNSHandler if an error appeared
- replaces Exceptions with more specific Runtime and UnexceptedValue
  Exceptions

- fixed typo in WNSHandler
- improved payload handling
- default payload is now array() instead of NULL
- some small changes in the readme.md