update check-key-code-map.rb for flatten simple_modifications.json
update check-key-code-map.rb for flatten simple_modifications.json

jgosmann/Karabiner-Elements-Neo,jgosmann/Karabiner-Elements-Neo,epegzz/Karabiner-Elements,jgosmann/Karabiner-Elements-Neo,tekezo/Karabiner-Elements,jgosmann/Karabiner-Elements-Neo,tekezo/Karabiner-Elements,jrolfs/Karabiner-Elements,epegzz/Karabiner-Elements,tekezo/Karabiner-Elements,tekezo/Karabiner-Elements,jrolfs/Karabiner-Elements,epegzz/Karabiner-Elements,jrolfs/Karabiner-Elements,jrolfs/Karabiner-Elements,epegzz/Karabiner-Elements