libweave: update OWNERS

BUG=None
TEST=None

Change-Id: Iece54c55d9e49ca0d81be3d7dab4138afea81186
Reviewed-on: https://chromium-review.googlesource.com/c/weave/libweave/+/1817427
Reviewed-by: Ben Chan <benchan@google.com>
Tested-by: Ben Chan <benchan@google.com>
1 file changed