Django-specifications

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- Dropped compatibility with Python < 3.8.
- Dropped compatibility with Django < 3.2.
- Modernized the package, added isort etc, moved from Travis CI to GitHub
actions.

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- Added a helper for adding specification field group fieldsets.
- Fixed a bug because the code wouldn't handle the case where several
specification fields were gone at once.
- Dropped compatibility guarantees with old versions of Django.

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- Reformatted the code using black.
- Added ``fields = '__all__'`` to the modelform as required by Django.
- Replaced the migrations generated by South.
- Added support for Django 1.8 LTS, 1.11 LTS and 2.1 while dropping
support for some older versions. Added support for Python 3.
- Added a testsuite, Travis CI integration and documentation on
readthedocs.io.
- Added a ``ModelAdminWithSpecification`` class which is especially
useful if you want to group specification fields into their own
fieldsets.

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- Switched from distutils to setuptools.
- Added utilities for analyzing and comparing objects with
specifications.

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- Initial public version.

.. _0.1: https://github.com/matthiask/django-specifications/commit/efc41b6f5e4
.. _0.2: https://github.com/matthiask/django-specifications/compare/0.1...0.2
.. _0.3: https://github.com/matthiask/django-specifications/compare/0.2...0.3
.. _0.4: https://github.com/matthiask/django-specifications/compare/0.3...0.4
.. _0.5: https://github.com/matthiask/django-specifications/compare/0.4...0.5
.. _Next version: https://github.com/matthiask/django-specifications/compare/0.5...master