Add support for Django 2.1#49

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mobiware wants to merge 2 commits intonetzkolchose:masterfrom

darwin-homes:django-21

Commits on Jul 17, 2020

Add support for Django 2.1
mobiware
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Commits on Feb 11, 2021

Allows opting out of bulk_update even with Django 2.2+
mobiware
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