CONTRIBUTING.md: update
CONTRIBUTING.md: update

upsilon/Mirakurun,kanreisa/Mirakurun,akimasa/Mirakurun,Chinachu/Mirakurun,Chinachu/Mirakurun,Chinachu/Mirakurun,kanreisa/Mirakurun,akimasa/Mirakurun,upsilon/Mirakurun,akimasa/Mirakurun,Chinachu/Mirakurun,upsilon/Mirakurun,kanreisa/Mirakurun