Django-pynotify

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* Add support for Python 3.10 and 3.11

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* Migrate CI from Travis to Github Actions
* Fix lint errors

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* Prevent duplicates of ``NotificationTemplate`` objects

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* Allow handlers that are not paired with any signal
* Return notifications created with ``notify`` helper function

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* Use ``JSONField`` instead of ``TextField`` for JSON based fields
* Add ``extra_fields`` to ``BaseTemplate``
* Drop Django 2.x support

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* Add ``is_locked`` field to ``AdminNotificationTemplate``