'Update the InstalledAddOnInstance
:param dict configuration: The JSON object representing the configuration
:param unicode unique_name: The string that uniquely identifies this Add-on installation
:returns: Updated InstalledAddOnInstance
:rtype: twilio.rest.preview.marketplace.installed_add_on.InstalledAddOnInstance'

def update(self, configuration=values.unset, unique_name=values.unset):

    data = values.of({'Configuration': serialize.object(configuration), 'UniqueName': unique_name})
    payload = self._version.update('POST', self._uri, data=data)
    return InstalledAddOnInstance(self._version, payload, sid=self._solution['sid'])
