Add sarahchin to OWNERS

Test: no test
Change-Id: I7f5f70532ec983ea37e7adecc90d0bfa03ebe7d4
diff --git a/OWNERS b/OWNERS
index 92458db..bce6270 100644
--- a/OWNERS
+++ b/OWNERS
@@ -10,3 +10,4 @@
 tgunn@google.com
 breadley@google.com
 nazaninb@google.com
+sarahchin@google.com