article: added delivery date

order-confirmation-mail-parser

@@ -120,10 +120,12 @@ class Article(Item):
         self.reseller = reseller
         assert shipper is None or type(shipper) is unicode
         self.shipper = shipper
+        self.delivery_date = None
 
     def dict_repr(self):
         attr = Item.dict_repr(self)
         attr.update({
+            'delivery_date': self.delivery_date,
             'quantity': self.quantity,
             'reseller': self.reseller,
             'shipper': self.shipper,