message: Update to CNCF Code of Conduct
diff: -This project is governed by [Lyft's code of conduct](https://github.com/lyft/code-of-conduct). All contributors and participants agree to abide by its terms.
  +## Community Code of Conduct
  +
  +Envoy follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
  