code: def update(self, role_sid=values.unset,
                 last_consumed_message_index=values.unset):
          
          return self._proxy.update(
              role_sid=role_sid,
              last_consumed_message_index=last_consumed_message_index,
          )
docs: Update the MemberInstance
  
          :param unicode role_sid: The Role assigned to this member.
          :param unicode last_consumed_message_index: An Integer representing index of the last Message this Member has read within this Channel
  
          :returns: Updated MemberInstance
          :rtype: twilio.rest.chat.v1.service.channel.member.MemberInstance