Edx-when

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* Added optimization when requesting course block dates for an outline, where block dates below subsections are unneeded.
* Use current version of the course to improve the cache key, along with using the TieredCache to cache date data.

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Added Django 3.2 Support

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Dropped python3.5 support.

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Don't warn about missing schedules for relative dates.
It happens for legitimate reasons, and the layer above can check instead.

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Updated travis badge in README.rst to point to travis-ci.com instead of travis-ci.org

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Django 3.x deprecation warnings are fixed