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/user_api_client.py

@@ -6,7 +6,7 @@ from app.notify_client.models import User
 
 class UserApiClient(BaseAPIClient):
     def __init__(self):
-        super(self.__class__, self).__init__("a", "b", "c")
+        super().__init__("a", "b", "c")
 
     def init_app(self, app):
         self.base_url = app.config['API_HOST_NAME']