Django-widget-tweaks

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* Add Django 4.2 support.
* Add Django 4.1 support.
* Drop Django 4.0 support.
* Drop Django 2.2 support.
* Add Python 3.11 support.
* Drop Python 3.7 support.

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* Set minimum required Python version to 3.7.
* Add better documentation syntax highlighting.
* Adjust build settings and stop building deprecated universal Python 2 wheels.

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* Add support for Django 4.0
* Drop support for Django 3.0 and 3.1
* Add support for Python 3.10
* Drop support for Python 3.6

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* Add support for Django 3.2
* Move to GitHub Actions.
* Drop support for Django 1.11.
* Add support for Python 3.9.

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* Fix Release version

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* Fix Travis deployment to Jazzband site