'Update the ChannelInstance
:param unicode friendly_name: The friendly_name
:param unicode unique_name: The unique_name
:param unicode attributes: The attributes
:returns: Updated ChannelInstance
:rtype: twilio.rest.chat.v1.service.channel.ChannelInstance'

def update(self, friendly_name=values.unset, unique_name=values.unset, attributes=values.unset):

    data = values.of({'FriendlyName': friendly_name, 'UniqueName': unique_name, 'Attributes': attributes})
    payload = self._version.update('POST', self._uri, data=data)
    return ChannelInstance(self._version, payload, service_sid=self._solution['service_sid'], sid=self._solution['sid'])
