Fix Requests.is_ajax() deprecation warning in Django 3.1 (#242)
Fix Requests.is_ajax() deprecation warning in Django 3.1 (#242)

See the Django 3.1 release notes for information about deprecating the
`Requests.is_ajax()` method.

https://docs.djangoproject.com/en/3.1/releases/3.1/
korfuri/django-prometheus,korfuri/django-prometheus