Wagtail-storages

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* Fix server crashing on serving a document.

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* Add compatibility for Wagtail 2.9

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* Add logo to the README.
* Add Content-Disposition header to signed S3 URLs for documents.
* Fix Django 3.0 test failures.
* Various metadata and README updates.

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* Add documentation.

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* Delete unit tests from the final package.

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* Initial release.