4.0.0

Update Python/Django support matrix.
Currently, django-phaxio is supporting:
Python: 3.7, 3.8, 3.9, 3.10
Django: 3.2, 4.0

BREAKING: drop support for Django 2.2 & 3.1

3.0.0

Update Python/Django support matrix.
Currently, django-phaxio is supporting:
Python: 3.7, 3.8, 3.9
Django: 2.2, 3.1, 3.2

[BREAKING]: add a trailing slash to the callback url. You will have to adapt your webhook url in phaxio settings to be like /phaxio/callback/.