Sphinxcontrib-django2

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* Fix deferred attribute for Django >=2.1, <3.0
* Django: Drop support for [1.11, 2.0], add support for [2.2, 3.0, 3.1]
* Python: Drop support for [2.7, 3.5], add support for [3.6, 3.7, 3.8]
* Replace force_text by force_str (deprecated in Django 4.0)
* Improved test coverage
* Support for Django ModelFields

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* Fix deferred attribute for Django 3.0.

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* Model fields always show verbose name if present.
* Model fields are skipped when they are already documented.
* Support "self" in foreign keys.
* Allow ``:setting:`` registration to fail
* Fixed ``runtests.py`` for Django 2.2
* Reformatted all source code with black, isort and flake8

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* Fixed Django 2.0 behavior when foreignkeys are strings.

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* Fixed Python 2 issue with ``list.clear()``.

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* Fixed Django 2.0 support
* Fixed missing form fields
* Fixed handling of ``ForeignKey('modelname')``