bootstat: add achant and markcheng as owner

Test: none
Change-Id: Ie4c218fe51b13407137c4374fe641f1818124fac
Signed-off-by: Jason Chiu <jasoncschiu@google.com>
diff --git a/bootstat/OWNERS b/bootstat/OWNERS
index 9e70e7d..71b4e0b 100644
--- a/bootstat/OWNERS
+++ b/bootstat/OWNERS
@@ -1 +1,3 @@
 dvander@google.com
+achant@google.com
+markcheng@google.com