implemented ClientUpdateGuestPassesList struct message

steam/core/msg/structs.py

@@ -294,4 +294,23 @@ class ClientMarketingMessageUpdate2(StructMessage):
 
         return '\n'.join(text)
 
+class ClientUpdateGuestPassesList(StructMessage):
+    result = EResult.Invalid
+    countGuestPassesToGive = 0
+    countGuestPassesToRedeem = 0
+    # there is more to parse, but I dont have an sample to figure it out
+    # fairly sure this is deprecated anyway since introduction of the invetory system
 
+    def load(self, data):
+        (result,
+         self.countGuestPassesToGive,
+         self.countGuestPassesToRedeem,
+        ) = struct.unpack_from("<III", data)
+
+        self.result = EResult(result)
+
+    def __str__(self):
+        return '\n'.join(["result: %s" % repr(self.result),
+                          "countGuestPassesToGive: %d" % self.countGuestPassesToGive,
+                          "countGuestPassesToRedeem: %d" % self.countGuestPassesToRedeem,
+                          ])