Django-contrib-comments

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* Confirmed support for Django 4.0.

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* Dropped support for Django 1.11, 2.0, and 2.1.
* Added the ``delete_stale_comments`` management command.
* Added db_index to ``object_pk`` and ``is_removed`` fields.
* Altered ``object_pk`` from ``TextField`` to ``CharField(max_length=64)``
so that the field can be indexed on MySQL, too. **Warning:** if you attach
comments to objects whose primary key is serialized to more than 64
characters, you should provide a custom Comment model
(more about that in the documentation) with an appropriate
``object_pk`` field.
* Confirmed support for Python 3.9.
* Added support for Django 3.2.

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* Removed support for Python 2.
* Renamed zh_CN to zh_Hans and zh_TW to zh_Hant to match
Django Chinese translations naming.
* Confirmed support for Django 3.1 and avoid deprecation warnings.
* Confirmed support for Python 3.8.
* Updated Arabic and German translations.

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* WARNING: This *is* the last version supporting Python 2.
* Confirmed support for Django 3.0.
* Prevented deprecation warnings with Django 3.0.
* Updated Danish and Indonesian translations.

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* WARNING: This is most probably the last version supporting Python 2.
* Added testing for Python 3.7.
* Confirmed support for Django 2.2 (no code changes required).
* Updated translations.

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* Added testing for Python 3.6.
* Confirmed support for Django 2.0 and 2.1.
* Dropped support for Django < 1.11.
* ``ip_address`` is set to None when ``REMOTE_ADDR`` is empty (93).