Update dependency django-model-utils to v3.2.0

[renovate]

This PR contains the following updates:

Package	Update	Change
django-model-utils	minor	==3.1.2 -> ==3.2.0

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Release Notes

jazzband/django-model-utils

v3.2.0

Compare Source

• 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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