Update OWNERS.

yim@ has moved to a different team a long time ago. Adding myself
as the most recent person to have made a change here and colefaust@
as a Python migration expert.

Test: N/A
Change-Id: I74a7f9616327fb9b369d07fe954be376cefcdebb
diff --git a/OWNERS b/OWNERS
index 86bfc9e..9a6f87a 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,2 @@
-# Default owners are top 3 or more active developers of the past 1 or 2 years
-# or people with more than 10 commits last year.
-# Please update this list if you find better owner candidates.
-yim@google.com
+colefaust@google.com
+krzysio@google.com