title: django migrations does not update database
body: <p>I have django app already online and running. I created new model and if I do the makemigrations, it is working fine, but if I want to migrate it, then I receive <code>Running migrations:No migrations</code> to apply. Even though that I made a change. The change is also in the migration file. I am using postgresql with it. I tried to delete the migration file and create it once more, but it did not help. Any idea what might be wrong?</p>