'Update the ParticipantInstance
:param ParticipantInstance.ParticipantType participant_type: The Type of this Participant
:param unicode identifier: The Participant\'s contact identifier, normally a phone number.
:param unicode friendly_name: A human readable description of this resource
:returns: Updated ParticipantInstance
:rtype: twilio.rest.preview.proxy.service.session.participant.ParticipantInstance'

def update(self, participant_type=values.unset, identifier=values.unset, friendly_name=values.unset):

    return self._proxy.update(participant_type=participant_type, identifier=identifier, friendly_name=friendly_name)
