KEP-3619: added haircommander as a reviewer

Signed-off-by: Shingo Omura <[email protected]>

Author: everpeace

keps/sig-node/3619-supplemental-groups-policy/kep.yaml

@@ -11,6 +11,7 @@ reviewers:
   - "@thockin"
   - "@mrunalp"
   - "@SergeyKanzhelev"
+  - "@haircommander"
 approvers:
   - "@mrunalp"