Django-smart-selects

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- Dropped support for Python 2.7 and 3.5! [jezdez]
- Dropped support for Django 1.11, 2.0 and 2.1! [jezdez]
- Add support for Python 3.9. [jezdez]
- Move CI to GitHub Actions: https://github.com/jazzband/django-smart-selects/actions [jezdez]
- Docs: elaborate usage within templates [amiroff]
- Ensure at least one option in the <select> element (as required in HTML) [d9pouces]
- Migrate to GitHub Actions [jezdez]
- Add example of chained FK as inline [manelclos]
- Support Django 3.2 and 4.0 [manelclos]

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- add Django 3.1 as supported
[d9pouces]

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- Reverting excessive lint correction that breaks init_value check
[prodigel]

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- Init horizontal filtered on load
[leibowitz]
- Add node variable initialization to fix node undefined error
[leibowitz]

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- Add Sphinx project and move current docs to it
[manelclos]
- Add pytest support
[manelclos]
- Support django up to 3.0.x
[manelclos]
- Fix chainedfk and chainedm2m not being defined (closes 253)
[manelclos]
- Add multichained selects to Location example
[manelclos]
- Force to load select2 js first
[leibowitz]
- Fixed bug with missing "renderer" parameter in widgets.py render methods
[glenngaetz]
- Fix renderer parameter in older django versions
[manelclos]
- Add link to PyPI and installation instructions
[Flimm]