Renaming the `model` attribute ?

Heyhey

I'm pretty sure that the model attribute either comes from the ruby world or the old days when phoenix tried to be more like ruby on rails and had models.
Wouldn't it to make sense to rename that attribute to `schema` since its basically just testing the schema and the changesets of it?

Just wondering why it did not happened yet or if there is a specific reason you stuck with the `model`.

If there is interest for it I surely can provide a pull request for it.

best
Denny