Update OWNERS.

We actually have an active maintainer for this project!

Test: N/A
Change-Id: I621bcc646dfd1ac83bc57fe972f671b941a683eb
diff --git a/OWNERS b/OWNERS
index 0088b03..80b7325 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1 @@
-# Default code reviewers picked from top 3 or more developers.
-# Please update this list if you find better candidates.
-enh@google.com
-chh@google.com
+maennich@google.com