Set the group hue.

        :param hue: Hue in decimal percent (0.0-1.0).

def hue(self, hue):
        """ Set the group hue.

        :param hue: Hue in decimal percent (0.0-1.0).
        """
        if hue < 0 or hue > 1:
            raise ValueError("Hue must be a percentage "
                             "represented as decimal 0-1.0")
        self._hue = hue
        cmd = self.command_set.hue(hue)
        self.send(cmd)