code: def update(self, configuration=values.unset, unique_name=values.unset):
          
          return self._proxy.update(configuration=configuration, unique_name=unique_name, )
docs: 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