Django-photologue

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- Checked compatibility with Django 3.1.
- Apply crop/effect changes to existing images (210).
- Encoding objects before hashing error (205).

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- Drop alpha channel only on jpeg save (contributed by drazen)
- Added zh_Hans translation (contributed by Lessica)
- improved Dutch translations (contributed by andreas.milants)

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- Added support for Django 3.
- Dropped support for Python 2, python 3.4 and Django 2.1.

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- Compatibility with Django 2.2.

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- Fixes when file doesn't exist in the file system but still is in S3.
- Doc tweaks - and added a page on how to actually use Photologue!
- Make setup compatible with latest version of pip.
- Checked compatibility with Django 2.1 and Python 3.7.
- Updated translations for Catalan and Basque.
- Missed a Django migration (issue 194).
- Test Tox; integrate with Travis and Coveralls.
- Removed old code (old-style demo templates that have been deprecated since 2014).
- Removed old code (old views that have been deprecated since 2014).
- Removed all references to PIL (which hasn't been updated since 2009). I think that by now
there are no servers left anywhere in the world that still use it :-)

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- Admin thumbnails were not displaying correctly.