PyPI Release: version 0.15

[gradyy]

Hi @jezdez or current maintainer,

When Django 2.2 LTS reaches end of support April 2022, version 0.14 on PyPi will no longer be compatible with any supported versions of Django. If you have the time, could you please build and release a package with the latest commits from master?

The master branch resolves these features being deprecated in Django 3.0

• django.shortcuts.render_to_response() will be removed.
• django.utils.six was removed (not documented in the log, but the package was removed from the module index. No documentation exists after version 1.11)