def update(self, role_sid=values.unset,<EOL>last_consumed_message_index=values.unset):
return self._proxy.update(<EOL>role_sid=role_sid,<EOL>last_consumed_message_index=last_consumed_message_index,<EOL>)<EOL>
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