Batch request

Hi, in the README i see

> Working with batch requests is also possible. To do that, set the parameter "set_batch":

Is this feature working?
Looking the code it seems is not ready:


`def _create_batch_node(self, onerror):

    """Prepare the request structure to support batch mode
    The params are like in enable_batch
    """

    pass  # pragma: no cover`
