Django-ilmoitin

Added:
* Support for `Django` 3.x
* Support for [`django-parler>=2`](https://django-parler.readthedocs.io/en/stable/)

Other changes:
* The new version of `django-parler` requires a new migration to be run.

Added:

- `Language` enum in GraphQL schema is now prefixed with the model name (i.e. `NotificationTemplateLanguage`) in order to avoid potential clashes with other language enums in a project

Added:

- Explicit resolver for `notification_templates`. This allows adding permission checking like this if you override the resolver on your `Query` class:

python
staticmethod
view_permission_required(NotificationTemplate)
def resolve_notification_templates(parent, info, **kwargs):
return django_ilmoitin_schema.Query.resolve_notification_templates(
parent, info, **kwargs
)

Fixed:
- Excluded `tests` folder from the wheel distribution

Added:

- `send_notification` util now accepts attachments
- GraphQL query for `NotificationTemplate`'s that you can add to your Graphene API

Fixed:
- Circular import error caused by `get_user_model` in `django_ilmoitin/models.py`