Django-snitch

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* Fix: Removed choices from event verb to solve migrations when a verb is added.

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* BREAKING CHANGE: migrate to `Celery 5 <https://docs.celeryproject.org/en/stable/whatsnew-5.0.html#upgrading-from-celery-4-x>`_
* Fix: eager condition.

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* Fix: notifications on save can be async or sync.

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* Fix: ensure "to", "reply_to", "cc" and "bcc" are valid email lists or None.

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* Fix: take into account cc, bcc and reply_to in async emails + fix typing.

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* Fix: Replace ugettext by gettext.
* Fix: Cast email subject to str in send method.
* Feat: Better type checking.
* Feat: Added extra data method por EventHandler.
* Feat: Added system to handle individual sending or batch sending for pushes.