PEP8 cleanup

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

tests/bulk_create/models.py

@@ -5,21 +5,26 @@ class Country(models.Model):
     name = models.CharField(max_length=255)
     iso_two_letter = models.CharField(max_length=2)
 
+
 class Place(models.Model):
     name = models.CharField(max_length=100)
 
     class Meta:
         abstract = True
 
+
 class Restaurant(Place):
     pass
 
+
 class Pizzeria(Restaurant):
     pass
 
+
 class State(models.Model):
     two_letter_code = models.CharField(max_length=2, primary_key=True)
 
+
 class TwoFields(models.Model):
     f1 = models.IntegerField(unique=True)
     f2 = models.IntegerField(unique=True)