Fix proxy getattr on Python 2.x

disco/gateway/events.py

@@ -64,9 +64,14 @@ class GatewayEvent(six.with_metaclass(GatewayEventMeta, Model)):
         return cls(obj, client)
 
     def __getattr__(self, name):
+        if six.PY3:
             _proxy = object.__getattr__(self, '_proxy', None)
             if _proxy:
                 return getattr(_proxy, name)
+        else:
+            if hasattr(self, '_proxy'):
+                return getattr(getattr(self, self._proxy), name)
+
         return object.__getattribute__(self, name)