Update dependency flake8-django to v1

This MR contains the following updates:

Package	Type	Update	Change
flake8-django	dev-dependencies	major	^0.0.4 -> ^1.0.0

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Release Notes

rocioar/flake8-django

v1.0.0

Compare Source

Bugfixes

• Bug fix for RenderChecker (@​GitRon)

Improvements

• Remove DJ04 check since Django uses dashes on their examples (@​rocioar)
• Remove DJ02 since it's not applicable anymore. Django has deprecated NullBooleanField. (@​rocioar)
• Added Model Content Order Check DJ12. (@​denizdogan)
• Remove tox, use Github Actions for running tests and coverage (@​rocioar)
• Drop support for Python 3.4 (@​rocioar)

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