doc/Platforms.md: update runtime versions
doc/Platforms.md: update runtime versions

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