Django-model-utils

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- Added `Choices.subset`.
- Remove hacks for previously supported Django versions. (Fixes GH-390)
- Dropped support for Python 2.7. (Fixes GH-393)
- Dropped usage of `six`
- Drop support for `Django 1.11`
- Add support for `Python 3.8`
- Add support for `Django 3.0`

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- Catch `AttributeError` for deferred abstract fields, fixes GH-331.
- Update documentation to explain usage of `timeframed` model manager, fixes GH-118
- Honor `OneToOneField.parent_link=False`.
- Fix handling of deferred attributes on Django 1.10+, fixes GH-278
- Fix `FieldTracker.has_changed()` and `FieldTracker.previous()` to return
correct responses for deferred fields.
- Add Simplified Chinese translations.
- Update AutoLastModifiedField so that at instance creation it will
always be set equal to created to make querying easier. Fixes GH-254
- Support `reversed` for all kinds of `Choices` objects, fixes GH-309
- Fix Model instance non picklable GH-330
- Fix patched `save` in FieldTracker
- Upgrades test requirements (pytest, pytest-django, pytest-cov) and
skips tox test with Python 3.5 and Django (trunk)
- Add UUIDModel and UUIDField support.

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- Update InheritanceIterable to inherit from
ModelIterable instead of BaseIterable, fixes GH-277.

- Add all_objects Manager for 'SoftDeletableModel' to include soft
deleted objects on queries as per issue GH-255

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- Update classifiers and README via GH-306, fixes GH-305

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- Support for Django 2.0 via GH-298, fixes GH-297
- Remove old travis script via GH-300
- Fix codecov and switch to py.test 301

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- Drop support for Python 2.6.
- Drop support for Django 1.4, 1.5, 1.6, 1.7.
- Exclude tests from the distribution, fixes GH-258.
- Add support for Django 1.11 GH-269
- Add a new model to disable pre_save/post_save signals