Django-use-email-as-username

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* Drop support for Python 3.5 and 3.6
* Compatible with Django 4.2
* Replace Poetry with PDM

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* Add tests for Python 3.11
* Compatible with Django 4.1

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* Add tests for Python 3.9
* Remove support for deprecated Python 3.4
* Compatible with Django 3.1
* Upgrade build system to poetry-core>=1.0.0
* Remove dependencies version ceiling
* Fix "django40 warning: django.utils.translation.ugettext_lazy() is deprecated"
* Add tests for Django 3.2
* Add tests for Django 4.0
* Add tests for Python 3.10

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* Fix distributed build - remove extra unnecessary files.

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* Fix `KeyError: 'skip checks'` error `[5] <https://github.com/jmfederico/django-use-email-as-username/issues/5>`_

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* Add tests for Python 3.8
* Compatible with Django 3.0