'Update the MemberInstance
:param unicode role_sid: The role_sid
:param unicode last_consumed_message_index: The last_consumed_message_index
:returns: Updated MemberInstance
:rtype: twilio.rest.chat.v1.service.channel.member.MemberInstance'

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)
