Bump djangorestframework from 3.9.0 to 3.9.1
Bump djangorestframework from 3.9.0 to 3.9.1

Bumps [djangorestframework](https://www.django-rest-framework.org/) from 3.9.0 to 3.9.1.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rloomans/measure-mate,rloomans/measure-mate,rloomans/measure-mate,rloomans/measure-mate