message: owners: fix email
diff: @@ -14,7 +14,7 @@ routing PRs, questions, etc. to the right place.
  * Alyssa Wilk ([alyssawilk](https://github.com/alyssawilk)) (alyssar@google.com)
  * HTTP, flow control, cluster manager, load balancing, and core networking (listeners,
  connections, etc.).
  -* Stephan Zuercher ([zuercher](https://github.com/zuercher)) (stephan@turbinelabs.io)
  +* Stephan Zuercher ([zuercher](https://github.com/zuercher)) (zuercher@gmail.com)
  * Load balancing, upstream clusters and cluster manager, logging, complex HTTP routing
  (metadata, etc.), and OSX build.
  * Greg Greenway ([ggreenway](https://github.com/ggreenway)) (ggreenway@apple.com)
  