'Update the SigningKeyInstance
:param unicode friendly_name: The friendly_name
:returns: Updated SigningKeyInstance
:rtype: twilio.rest.api.v2010.account.signing_key.SigningKeyInstance'

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

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