Django-airplane

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* 2023/06/29
* Changed test suite to Python 3.8-3.11, Django 4.1, 4.2 (old versions dropped)

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* URL to filename re-writing mechanism was creating files that didn't work on
Windows, changed how the files are named and stored

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* add AUTO_CACHE feature that fetches if url isn't in the cache
* added support for schemaless urls
* removed support for Python 2
* updated dependancies to recent versions

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* fixing a merge conflict that got missed

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* updated dependancies to working versions
* updated minimum django to secure 2.0.2, added tox testing for 2.1.2
* deprecated python 3.5
* changed wheel to build universal
* upgraded packages in requirements.txt for minimum versions in testing
* moved minimum version of python3 to 3.6
* changed tox testing for django 1.11, 2.1, 2.2

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* **BREAKING CHANGE**: changed cache filename format
* added management commands for listing and adding to cache
* changed testing to be against django 1.11, 2.0