Bump version to 6.1.2.

Merge pull request #60 from christianwgd/master

Replace django.conf.url with django.urls.path

Bump version to 6.1.1.

Merge pull request #56 from satendra02/patch-1

Use twine and set long_description_content_type

Bump to version 6.1.0

Merge pull request #59 from incuna/travis-django-3

Fix travis config warnings.

Exclude Django 3 from Python 3.5

Fix travis excludes.

Add Django 2.3 and 3 to TravisCI build

Merge pull request #58 from adam-thomas/patch-1

Fix a missed instance of `staticfiles`

Merge pull request #57 from christianwgd/master