Update django-ajax dependency

[fjbardelli]

The new version of djangoajax (3.0.2), is not compatible?

[oscarmlage]

Haven't tried yet, why do you say it's not compatible? Could you please give some feedback, error logs, etc... about it? (thanks in advance).

[fjbardelli]

When I try to use it, it tells me that it does not find the js, whereas if I use the previous version it goes without problems

[luisza]

This is the reason
yceruto/django-ajax#42

[telenieko]

From #103:

in setup.py we have django>=2 and django-ajax==2.3.7 but django-ajax v2 is for django<2 and django-ajax v3 is for django>=2

Also, it is noted there that the AJAX related functionality lacks unit testing, which makes the version updated much harder. Not being able to update django-ajax dependency prevents setting minimum supported versions due to the version incompatibilities noted there.