Update OWNERS

Add dimitrysh@ and remove zachr@

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Change-Id: If807033e5a16752be759efbae9506767927f96e4
diff --git a/OWNERS b/OWNERS
index 75e29ae..dd8e743 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,5 +1,5 @@
 adelva@google.com
+dimitrysh@google.com
 john.stultz@linaro.org
 marcheu@google.com
 seanpaul@google.com
-zachr@google.com