PEP8 cleanup

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

tests/expressions/models.py

@@ -15,6 +15,7 @@ class Employee(models.Model):
     def __str__(self):
         return '%s %s' % (self.firstname, self.lastname)
 
+
 @python_2_unicode_compatible
 class Company(models.Model):
     name = models.CharField(max_length=100)