Update the reusable app for Django 2.0.

setup.py

@@ -2,7 +2,7 @@ from setuptools import setup
 
 setup(
     name='test_oauth2_django',
-    version='0.1',
+    version='0.2',
     description='A basic library for Django apps to use TEST Alliance OAuth2.',
     url='https://git.pleaseignore.com/sharad/test_oauth2_django',
     author='Sharad Heft',

test_oauth/migrations/0002_django20.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('test_oauth', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='testoauth2data',
+            name='primary_character',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.SET_NULL, default=None, to='test_oauth.Character', null=True),
+            preserve_default=True,
+        ),
+    ]

test_oauth/models.py

@@ -26,6 +26,7 @@ class Character(models.Model):
 class TESTOAuth2Data(models.Model):
     user = models.OneToOneField(
         settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
         primary_key=True,
         related_name='auth'
     )
@@ -33,7 +34,12 @@ class TESTOAuth2Data(models.Model):
     access_token = models.CharField(max_length=128)
     refresh_token = models.CharField(max_length=128)
 
-    primary_character = models.ForeignKey(Character, null=True, default=None)
+    primary_character = models.ForeignKey(
+        Character,
+        on_delete=models.SET_NULL,
+        null=True, 
+        default=None
+    )
 
     class Meta:
         verbose_name = 'OAuth2 Token'