Remove extraneous arguments to super

> dont need self.__class__, self in super - that's a python 2.x crutch.
> super() is equivalent

app/notify_client/service_api_client.py

@@ -9,7 +9,7 @@ class ServiceAPIClient(NotificationsAPIClient):
     # Fudge assert in the super __init__ so
     # we can set those variables later.
     def __init__(self):
-        super(self.__class__, self).__init__("a", "b", "c")
+        super().__init__("a", "b", "c")
 
     def init_app(self, application):
         self.base_url = application.config['API_HOST_NAME']