update owners file

Change-Id: I88bde99c7ecf81fd8924c2f318a27462d292a610
diff --git a/OWNERS b/OWNERS
index 39be2c1..4ec2718 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,6 +1,6 @@
 breadley@google.com
-hallliu@google.com
 tgunn@google.com
 xiaotonj@google.com
-shuoq@google.com
+chinmayd@google.com
+tjstuart@google.com
 rgreenwalt@google.com