def update(self, webhook_url=values.unset, friendly_name=values.unset,<EOL>reachability_webhooks_enabled=values.unset,<EOL>acl_enabled=values.unset):
return self._proxy.update(<EOL>webhook_url=webhook_url,<EOL>friendly_name=friendly_name,<EOL>reachability_webhooks_enabled=reachability_webhooks_enabled,<EOL>acl_enabled=acl_enabled,<EOL>)<EOL>
Update the ServiceInstance

:param unicode webhook_url: The webhook_url
:param unicode friendly_name: The friendly_name
:param bool reachability_webhooks_enabled: The reachability_webhooks_enabled
:param bool acl_enabled: The acl_enabled

:returns: Updated ServiceInstance
:rtype: twilio.rest.preview.sync.service.ServiceInstance