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Small updates
- Unpin `dj-database-url` from a specific minor version to a specific major version.
- Initial support for deleting django models. I'm not going to update the docs just yet
as I don't entirely like this solution...something is better than nothing.
Check the `test_deleted_model_in_settings` tests to see this. The issue is that django
needs to know about a model after you've deleted the class so sharded settings on deleted
models need to be tracked somewhere.