Pylint

**Bugfixes**

- Fixed compatability with astroid 2.9.1 (343)
-
**New**

- Removed false positive error of missing member in TextChoices tuples 298 (see pulls 330 and 345)
- Moved from Travis CI to GitHub Actions (336 and 340)
- Added pre-commit configuration and began enforcing black/isort code formatting
- Multiple test fixes (including 338) - newer versions of pylint expect a different format for the expected messages txt files.
- Bumped dependency for pylint-django-utils to get `multi-threaded pylint support (https://github.com/PyCQA/pylint-plugin-utils/pull/21)

* Exempt all the names found in type annotations from ``unused-import``

The previous code was assuming that only ``typing`` names need to be
exempted, but we need to do that for the rest of the type comment
names as well.

Close 3112

* Relax type import detection for names that do not come from the ``typing`` module

Close 3191

- Moved `Faker` dependencies to test-only. Closes 304

- Relaxed Faker package versioning requirement for ``Faker`` (Robin Chow)

- Allowed configuration of the Django settings module to be used via a
commandline argument `286 <https://github.com/PyCQA/pylint-django/issues/286>`_
- If Django settings are not specified via a commandline argument or environment
variable, an error is issued but defaults are loaded from Django, removing the
fatal error behaviour. `277 <https://github.com/PyCQA/pylint-django/issues/277>`_
and `243 <https://github.com/PyCQA/pylint-django/issues/243>`_
- Fixed tests to work with pylint>2.6
- Fixed ``AttributeError: 'Subscript' object has no attribute 'name'`` error.
Closes `284 <https://github.com/PyCQA/pylint-django/issues/284>`_ (uy-rrodriguez)
- Pin Faker version to Prevent Asteroid Crash (James Pulec)
- Remove Python 3.5 Support (EOL since Sept 2020 and Faker requires 3.6 anyway)
(James Pulec)
- Fixed reverse manager ``update_or_create`` calls (James Pulec)