Django-taggit

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* Added Finnish translation.
* Updated Chinese translation.
* Updated Esperanto translation.
* Fix ``form.changed_data`` to allow early access for a tags defined with
``blank=True``.

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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``.

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* The project has moved to `Jazzband <https://jazzband.co/>`_. This is the
first release under the new organization. The new repository URL is
`<https://github.com/jazzband/django-taggit>`_.
* Added support for Django 2.2.
* Fixed a race condition in ``TaggableManager``.
* Removed method ``ItemBase.bulk_lookup_kwargs()``.
* Fixed view ``tagged_object_list`` to set ``queryset.model`` as
``ListView.model`` (was previously set as a ``ContentType`` instance).
* ``_TaggableManager`` and ``TaggableManager`` now always call the parent
class ``__init__``.
* Removed ``TaggableRel`` and replaced uses with ``ManyToManyRel``.

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* **Backwards incompatible:** Remove support for Django < 1.11
* Added support for Django 2.1 and Python 3.7
* Moved TagWidget value conversion from TagWidget.render() to TagWidget.format_value()

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* Added support for Django 2.0
* **Backwards incompatible:** Dropped support for EOL Python 3.3

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* Update spanish translation
* Add testing for Django 1.11 and Python 3.6
* introduce isort and flake8 in the CI
* [docs] Fixed links to external apps
* Improved auto-slug in TagBase to support UUID pk
* [docs] Added contribution guidelines