Can't make migrations using Postgres

I noticed that if I changed the database to Postgres before doing the initial `migrate`, it would fail with the error

`django.db.utils.ProgrammingError: relation "auth_group" does not exist`

After a couple of hours I found the issue. So, I would like to suggest to add to the manual a Note that says that, if using Postgres, you need to run first:

`python manage.py migrate auth`

and then

`python manage.py migrate`

This will apply first the dependencies so that the general migration can work. If you don't run it like this, it just won't work.

Regards.