Django 3.0 support

[auvipy]

DRF 3.11 is also planning to dro django 1.11 support

[sliverc]

Django 1.11 is supported till April 2020 and in DJA we do not have any compat/workarounds etc. for it, so I don't see that we have to remove support for it until official support has ended.

In terms of support for Django 3.0 PR is welcome which tests it with the current beta version.

[auvipy]

OK