PEP8 cleanup

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

tests/custom_columns/models.py

@@ -33,6 +33,7 @@ class Author(models.Model):
         db_table = 'my_author_table'
         ordering = ('last_name', 'first_name')
 
+
 @python_2_unicode_compatible
 class Article(models.Model):
     headline = models.CharField(max_length=100)