reorganize imports with ruff

pedagogy/migrations/0001_initial.py

@@ -2,10 +2,10 @@
 # Generated by Django 1.11.20 on 2019-07-05 14:32
 from __future__ import unicode_literals
 
-from django.conf import settings
 import django.core.validators
-from django.db import migrations, models
 import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):