Upstream switched from Django 2.1 to Django 2.2. The reason behind this is that it fixes intermittent errors when objects are deleted/manipulated. (https://github.com/digitalocean/netbox/issues/2621). Django 2.2 is also designed as new LTS release so it makes sense to switch over to that version. (https://www.djangoproject.com/download/#supported-versions)
The whole diff does following actions in short:
* Update www/Makefile
* Repocopy following ports, assign them to Django 2.2 and limit them to Python 3.5 or later:
** www/py-django-cacheops -> www/py-dj22-django-cacheops
** www/py-django-cors-headers -> www/py-dj22-django-cors-headers
** www/py-django-debug-toolbar -> www/py-dj22-django-debug-toolbar
** www/py-django-filter -> www/py-dj22-django-filter
** www/py-django-js-asset -> www/py-dj22-django-js-asset
** www/py-django-mptt -> www/py-dj22-django-mptt
** www/py-django-prometheus -> www/py-dj22-django-prometheus
** www/py-django-tables2 -> www/py-dj22-django-tables2
** www/py-django-taggit-serializer -> www/py-dj22-django-taggit-serializer
** www/py-django-timezone-field -> www/py-dj22-django-timezone-field
** www/py-drf-yasg -> www/py-dj22-drf-yasg
* Update all related CONFLICTS_INSTALL entries