Django-taggit

~~~~~~~~~~~~~~~~~~

* **Backwards incompatible:** ``TaggableManager.set`` now takes a list of tags
(instead of varargs) so that its API matches Django's ``RelatedManager.set``. Example:

- previously: ``item.tags.set("red", "blue")``
- now: ``item.tags.set(["red", "blue"])``

* Fix issue where ``TagField`` would incorrectly report that a field has changed on empty values.
* Update Russian translation.
* Add Persian translation
* Fix issue for many languages where content types were not being properly translated.
* Provide translators additional context regarding strings in TagBase model.

~~~~~~~~~~~~~~~~~~

* Fix compiled Ukranian translation (which would cause a failure on load for this locale).
* Update compiled Danish translation.

~~~~~~~~~~~~~~~~~~

* Vendor in the `django-taggit-serializer` project (under `taggit.serializers`).
* Add Arabic translation.
* Add Ukranian translation.

~~~~~~~~~~~~~~~~~~

* Add Python 3.9 support.
* Remove Python 3.5 support.
* Add Django 3.2 support.
* Remove Django 1.11 and 3.0 support.
* Add Danish translation.
* Fix crashing that could occur with ``similar_objects`` in multi-inheritance contexts.
* Add support for custom fields on through table models with `through_defaults` for ``TaggedManager.add`` and ``TaggedManager.set``.

~~~~~~~~~~~~~~~~~~

* Model and field ``verbose_name`` and ``verbose_name_plural`` attributes are
now lowercase. This simplifies using the name in the middle of a sentence.
When used as a header, title, or at the beginning of a sentence, a text
transformed can be used to adjust the case.
* Fix prefetch_related when using UUIDTaggedItem.
* Allow for passing in extra constructor parameters when using
``TaggableManager.add``. This is especially useful when using custom
tag models.

~~~~~~~~~~~~~~~~~~

* **Removed** support for end-of-life Django 2.0 and 2.1.
* Added support for Django 3.0.
* Added support for Python 3.8.
* Moved ``TaggedItemBase.tags_for()`` to ItemBase.
* Replaced reference to removed Django's ``.virtual_fields`` with
``.private_field``.
* Added ``TextareaTagWidget``.