OWNERS: Update Igor Username

Gerrit seems to want the associated Username, not the Name. Try that

Change-Id: Iddef9a1dd467b4f4353f9bed2c7c404fc91a81f8
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/OWNERS b/OWNERS
index ed159e2..5786c44 100644
--- a/OWNERS
+++ b/OWNERS
@@ -33,7 +33,7 @@
 
 owners:
 - bradleyb@fuzziesquirrel.com
-- IE Kononenko
+- i-kononenko
 
 reviewers: