Update CONTRIBUTION.md
Update CONTRIBUTION.md

hachibasu/koko,alienxp03/koko,noraesae/koko,noraesae/koko,KokoIRC/koko,woss/koko,alienxp03/koko,woss/koko,KokoIRC/koko,hachibasu/koko,alienxp03/koko,woss/koko,noraesae/koko,KokoIRC/koko,hachibasu/koko