code: 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'],
          )
docs: Update the ChannelInstance
  
          :param unicode friendly_name: A human-readable name for the Channel.
          :param unicode unique_name: A unique, addressable name for the Channel.
          :param unicode attributes: An optional metadata field you can use to store any data you wish.
  
          :returns: Updated ChannelInstance
          :rtype: twilio.rest.chat.v1.service.channel.ChannelInstance