kiji-delegation: SCHEMA-760. Update REVIEWERS file in kiji-delegation.

issue: https://jira.kiji.org/browse/SCHEMA-760
review: https://review.kiji.org/r/1812
commit: https://github.com/kijiproject/kiji-delegation/commit/e0dd82e24e0fdc4ebb45e0cd53c32c9688e09b30