'Update the CredentialListInstance
:param unicode friendly_name: The friendly_name
:returns: Updated CredentialListInstance
:rtype: twilio.rest.api.v2010.account.sip.credential_list.CredentialListInstance'

def update(self, friendly_name):

    data = values.of({'FriendlyName': friendly_name})
    payload = self._version.update('POST', self._uri, data=data)
    return CredentialListInstance(self._version, payload, account_sid=self._solution['account_sid'], sid=self._solution['sid'])
