Update initial migration to work on Python 3

rest_framework/authtoken/migrations/0001_initial.py

-
+# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
 from django.db import models, migrations
@@ -15,9 +15,9 @@ class Migration(migrations.Migration):
         migrations.CreateModel(
             name='Token',
             fields=[
-                ('key', models.CharField(max_length=40, serialize=False, primary_key=True)),
+                ('key', models.CharField(primary_key=True, serialize=False, max_length=40)),
                 ('created', models.DateTimeField(auto_now_add=True)),
-                ('user', models.OneToOneField(related_name=b'auth_token', to=settings.AUTH_USER_MODEL)),
+                ('user', models.OneToOneField(to=settings.AUTH_USER_MODEL, related_name='auth_token')),
             ],
             options={
             },