Edx-when

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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

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Don't return due dates for enrollments originally created too close to the
course end to allow for finishing the course in time.