Sphinxcontrib-django2

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* Support django.db.models.JSONField
* List choices of choice fields

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* Add support for Python 3.9
* Add support for django-mptt with Django >=3.1
* Append initial docstrings to attributes
* Fix mutable references of pre-commit hooks
* Fix tests for sphinx 3.5.0

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* Add support for GenericForeignKey field of django.contrib.contenttypes

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* Fix Intersphinx mappings to AppConfig and Manager classes

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* Fix more Intersphinx mappings to Django classes
* Refactor package structure
* Refactor tests
* Improve docstring output
* Improve handling of related and reverse related fields
* Add documentation for sphinxcontrib_django2 itself
* Improve docstrings of iterable data
* Add config value for Django settings
* Load autodoc and intersphinx extensions in setup()
* Provide default intersphinx_mapping
* Return extension metadata in setup()
* Move dev dependencies from Pipfile to setup.py
* Add readthedocs.io integration

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* Fix Intersphinx mappings to Django classes
* 100% test coverage