'Deregisters the specified task definition. You will no longer
be able to run tasks from this definition after
deregistration.
:type task_definition: string
:param task_definition: The `family` and `revision` (
`family:revision`) or full Amazon Resource Name (ARN) of the task
definition that you want to deregister.'

def deregister_task_definition(self, task_definition):

    params = {'taskDefinition': task_definition}
    return self._make_request(action='DeregisterTaskDefinition', verb='POST', path='/', params=params)
