Update readme

Change-Id: I859b6c87050b5c2eb7f43eb55b052a5bb125603a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1669648
Auto-Submit: Allen Robinson <arobins@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672088}
1 file changed