add created_at field for ReserveResultPojo

src/pojo/ReserveResultPojo.py

@@ -101,6 +101,7 @@ class ReserveResultPojo:
             u'slot_position': self.slot_position,
             u'ccid': self.ccid,
             u'source_from': self.source_from,
+            u'created_at': self.created_at,
             u'store_type': self.store_type,
             u'accepted': self.accepted,
             u'url_validated': self.url_validated,