Merge pull request #290 from square/zachklipp/zach-explicit-owner

Add zach-klippenstein as an explicit owner (for PRs) since he's not on the Foundation team anymore.

Author: zach-klippenstein

.github/CODEOWNERS

@@ -1,3 +1,3 @@
 # These owners will be the default owners for everything in
 # the repo, unless a later match takes precedence.
-* @square/mobile-foundation-android
+* @square/mobile-foundation-android zach-klippenstein