Automatic AppConfig discovery for support Django 3.2

[claudiokc]

https://docs.djangoproject.com/en/4.0/releases/3.2/#what-s-new-in-django-3-2

This fix the error or warning when trying to add django_ltree in the INSTALLED_APPS settings.

django.utils.deprecation.RemovedInDjango41Warning: 'django_ltree' defines
default_app_config = 'django_ltree.apps.DjangoLtreeConfig'. Django now detects
this configuration automatically. You can remove default_app_config.

[simkimsia]

I like to upgrade to Django 3.2 is this going to be merged?

[simkimsia]

@claudiokc i want to thank you for writing the PR. I haven't tested it yet on a Django 3.2. But I merged your PR under my fork of this library.

My reasons for forking it are https://github.com/GreenDeploy-io/greendeploy-django-ltree#why-fork

Also I haven't created a pypi package yet. https://github.com/GreenDeploy-io/greendeploy-django-ltree#install

But I intend to.

Happy to switch back to this dependency for my own needs if the maintenance ever gets revived.

If you want to help me making that fork on pypi and moving towards Django 3.2 and dropping support for older versions, feel free to reply here

Just to be upfront, I'm doing an Ask culture move where I fully realize the answer may be a no or I get no responses.

So don't feel pressured in any way.

Thank you once again for writing this.