'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'

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

    return self._proxy.update(webhook_url=webhook_url, friendly_name=friendly_name, reachability_webhooks_enabled=reachability_webhooks_enabled, acl_enabled=acl_enabled)
