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* **Backwards incompatible:** Remove support for Python 2.
* Added ``has_changed()`` method to ``taggit.forms.TagField``.
* Added multi-column unique constraint to model ``TaggedItem`` on fields
``content_type``, ``object_id``, and ``tag``. Databases that contain
duplicates will need to add a data migration to resolve these duplicates.
* Fixed ``TaggableManager.most_common()`` to always evaluate lazily. Allows
placing a ``.most_common()`` query at the top level of a module.
* Fixed setting the ``related_name`` on a tags manager that exists on a model
named ``Name``.