Django-dirtyfields

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*New:*
- Confirm support of Django 3.2

*Changed:*
- Remove pytz as a dependency.

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*New:*
- Drop support of Python 2.7
- Drop support of Python 3.5
- Confirm support of Python 3.8
- Confirm support of Python 3.9
- Confirm support of Django 3.0
- Confirm support of Django 3.1

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*Bugfix:*
- Fixes an issue when :code:`refresh_from_db` was called with the :code:`fields` argument, the dirty state for all
fields would be reset, even though only the fields specified are reloaded from the database. Now only the reloaded
fields will have their dirty state reset (154).
- Fixes an issue where accessing a deferred field would reset the dirty state for all fields (154).

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*New:*
- Drop support of Python 3.4
- Drop support of Django 1.8
- Drop support of Django 1.9
- Drop support of Django 1.10
- Confirm support of Python 3.7
- Confirm support of Django 2.0
- Confirm support of Django 2.1
- Confirm support of Django 2.2

*Bugfix:*
- Fixes tests for Django 2.0
- :code:`refresh_from_db` is now properly resetting dirty fields.
- Adds :code:`normalise_function` to provide control on how dirty values are stored

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*New:*

- Updates python classifier in setup file (116). Thanks amureki.
- Adds PEP8 validation in travisCI run (123). Thanks hsmett.

*Bugfix:*

- Avoids :code:`get_deferred_fields` to be called too many times on :code:`_as_dict` (115). Thanks benjaminrigaud.
- Respects :code:`FIELDS_TO_CHECK` in `reset_state` (114). Thanks bparker98.

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*New:*

- Drop support for unsupported Django versions: 1.4, 1.5, 1.6 and 1.7 series.
- Fixes issue with verbose mode when the object has not been yet saved in the database (MR 99). Thanks vapkarian.
- Add test coverage for Django 1.11.
- A new attribute :code:`FIELDS_TO_CHECK` has been added to :code:`DirtyFieldsMixin` to specify a limited set of fields to check.

*Bugfix:*

- Correctly handle :code:`ForeignKey.db_column` :code:`{}_id` in :code:`update_fields`. Thanks Hugo Smett.
- Fixes 111: Eliminate a memory leak.
- Handle deferred fields in :code:`update_fields`