Remove python_2_unicode_compatible method

example/orders/models.py

@@ -1,12 +1,10 @@
 from django.db import models
 from django.utils.dates import MONTHS_3
-from django.utils.six import python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
 from polymorphic.models import PolymorphicModel
 
 
-@python_2_unicode_compatible
 class Order(models.Model):
     """
     An example order that has polymorphic relations
@@ -23,7 +21,6 @@ class Order(models.Model):
         return self.title
 
 
-@python_2_unicode_compatible
 class Payment(PolymorphicModel):
     """
     A generic payment model.