Adds a tag to a task. Returns an empty data block.

        Parameters
        ----------
        task : {Id} The task to add a tag to.
        [data] : {Object} Data for the request
          - tag : {Id} The tag to add to the task.

def add_tag(self, task, params={}, **options): 
        """Adds a tag to a task. Returns an empty data block.

        Parameters
        ----------
        task : {Id} The task to add a tag to.
        [data] : {Object} Data for the request
          - tag : {Id} The tag to add to the task.
        """
        path = "/tasks/%s/addTag" % (task)
        return self.client.post(path, params, **options)