minor changes

chains/osher_ad.py

@@ -0,0 +1,12 @@
+from chains.cerberus_web_client import CerberusWebClient
+from supermarket_chain import SupermarketChain
+
+
+class OsherAd(CerberusWebClient, SupermarketChain):
+
+    _date_hour_format = '%Y-%m-%d %H:%M:%S'
+    _class_name = 'OsherAd'
+
+    @property
+    def username(self):
+        return self._class_name