- Use an AutoField until Django 3.2 is the only supported version

- Dropped support for Python 3.5.

- Dropped support for Django 1.11, 2.1 and 3.0.
- Add testing for Python 3.9.
- Add testing for Django 3.1 and 3.2.
- Fix bug llazzaro#508. Fullcalendar API filters cancelled occurrences.

Remove deprecated/default values from Travis configuration

Tagging version 0.9.2

Remove Django 3.0 trove classifier

It is not yet available on PyPI.

Fixes error:

    HTTPError: 400 Client Error: Invalid value for classifiers. Error: 'Framework :: Django :: 3.0' is not a valid choice for this field for url: https://upload.pypi.org/legacy/

Bump version number to prepare for release

Update setup.py supported python version

increase version

increase version

increase version for next release