Add .ruby-version for rvm, etc.
Add .ruby-version for rvm, etc.

nis-sdn/odenos,o3project/odenos,y-higuchi/odenos,narry/odenos,o3project/odenos,haizawa/odenos,machaharu/odenos,haizawa/odenos,machaharu/odenos,nis-sdn/odenos,narry/odenos,y-higuchi/odenos,nis-sdn/odenos,haizawa/odenos,machaharu/odenos,y-higuchi/odenos,o3project/odenos,machaharu/odenos,narry/odenos,machaharu/odenos,nis-sdn/odenos,o3project/odenos,narry/odenos,narry/odenos,o3project/odenos,y-higuchi/odenos,haizawa/odenos,haizawa/odenos,nis-sdn/odenos,y-higuchi/odenos