Pylint-django

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- Updating dependency version of pylint-plugin-utils as pylint 2.3 release
was not compatible `220 <https://github.com/pylint-dev/pylint-django/issues/220>`_
- Improvements to tox.ini:
`217 <https://github.com/pylint-dev/pylint-django/issues/217>`_
and `216 <https://github.com/pylint-dev/pylint-django/issues/216>`_ (aerostitch)
- Add support for new load_configuration hook of pylint
`214 <https://github.com/pylint-dev/pylint-django/issues/214>`_ (matusvalo)
- 'urlpatterns' no longer reported as an invalid constant name

---------------------------

Bumping the version number because there's been a mix-up between
GitHub tags and the versions pushed to PyPI for 2.0.3 and 2.0.4.

Please use 2.0.5 which includes the changes mentioned below!

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- Avoid traceback with concurrent execution. Fix
`197 <https://github.com/pylint-dev/pylint-django/issues/197>`_
- Suppress ``no-member`` errors for ``LazyFunction`` in factories
- Suppress ``no-member`` errors for ``RelatedManager`` fields
- Clean up compatibility code:
`PR 207 <http://github.com/pylint-dev/pylint-django/pull/207>`_

--------------------------

- Fixing compatibility between ranges of astroid (2.0.4 -> 2.1) and
pylint (2.1.1 -> 2.2).
`201 <https://github.com/pylint-dev/pylint-django/issues/201>`_ and
`202 <https://github.com/pylint-dev/pylint-django/issues/202>`_

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- Suppress false-positive no-self-argument in factory.post_generation. Fix
`190 <https://github.com/pylint-dev/pylint-django/issues/190>`_ (Federico Bond)

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- Enable testing with Django 2.1
- Add test for Model.objects.get_or_create(). Close
`156 <https://github.com/pylint-dev/pylint-django/issues/156>`__
- Add test for objects.exclude(). Close
`177 <https://github.com/pylint-dev/pylint-django/issues/177>`__
- Fix Instance of 'Model' has no 'id' member (no-member),
fix Class 'UserCreationForm' has no 'declared_fields' member. Close
`184 <https://github.com/pylint-dev/pylint-django/issues/184>`__
- Fix for Instance of 'ManyToManyField' has no 'add' member. Close
`163 <https://github.com/pylint-dev/pylint-django/issues/163>`__
- Add test & fix for unused arguments on class based views