make it working with django-filer 3+

[joshyu]

Currently djangocms-versioning-filer doesn't work with the latest django-filer version 3.1.3.
In order to make it working with Django CMS 4.1, I think it's necessary to make this addon working with django-filer 3+

[Aiky30]

Hi @joshyu , what is the latest known django-filer version to be working with this package?

[joshyu]

Hi @Aiky30,
https://github.com/django-cms/django-filer/tree/release/2.2.x the latest workable version is 2.2.7.