PEP8 cleanup

Signed-off-by: Jason Myers <jason@jasonamyers.com>

tests/basic/models.py

@@ -19,11 +19,13 @@ class Article(models.Model):
     def __str__(self):
         return self.headline
 
+
 class ArticleSelectOnSave(Article):
     class Meta:
         proxy = True
         select_on_save = True
 
+
 @python_2_unicode_compatible
 class SelfRef(models.Model):
     selfref = models.ForeignKey('self', null=True, blank=True,