Support for Django 2.2

[rgcarrasqueira]

Hello!

This project is it active yet?

I'm having issues to install it on app running on Django 2.2, there is appearing this error:

File "/core/api.py", line 7, in <module>
    from core.contacts.resources import ContactResource, StaticListResource
  File "/core/contacts/resources.py", line 32, in <module>
    class ContactResource(resources.MongoEngineResource):
  File "/lib/python3.7/site-packages/tastypie/resources.py", line 1836, in __new__
    setattr(meta, 'object_class', meta.queryset.model)
AttributeError: 'QuerySet' object has no attribute 'model'