Update prestart.sh

prestart.sh

@@ -1,5 +1,5 @@
 # Run collect static and migrations
 python manage.py collectstatic --noinput
 python manage.py migrate
-python manage.py shell -c "from django.contrib.auth.models import User; User.objects.create_superuser('admin', 'admin@example.com', 'adminpass')"
+python manage.py createsuperuser --username admin --email [email protected] --password admin