authz: update 1.4 release notes (#5601)

* authz: update 1.4 release notes

* Update content/en/news/2019/announcing-1.4/change-notes/index.md

Co-Authored-By: Martin Taillefer <geeknoid@users.noreply.github.com>
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Yangmin Zhu 2019-11-11 13:28:53 -08:00 committed by Istio Automation
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## Security
- **Added** the [`v1beta1` authorization policy model](/docs/concepts/security#authorization) for enforcing access control. This will eventually replace the [`v1alpha1` RBAC policy](/docs/reference/config/authorization/istio.rbac.v1alpha1/).
- **Improved** Citadel to periodically check and rotate the expired root certificate when running in self-sign CA mode.
## Telemetry