Updates :class:`Command` instance with updated attribute.

        This works similarly to the :func:`.command` decorator in terms
        of parameters in that they are passed to the :class:`Command` or
        subclass constructors, sans the name and callback.

def update(self, **kwargs):
        """Updates :class:`Command` instance with updated attribute.

        This works similarly to the :func:`.command` decorator in terms
        of parameters in that they are passed to the :class:`Command` or
        subclass constructors, sans the name and callback.
        """
        self.__init__(self.callback, **dict(self.__original_kwargs__, **kwargs))