add new brew cask Chrome path

I've only recently began to use Homebrew Cask to install apps on OS X and it appears that the path for the Google Chrome installation has changed from `/opt/homebrew-cask/Caskroom/google-chrome/stable-channel/` to `/opt/homebrew-cask/Caskroom/google-chrome/latest/`. This caused my newly installed `morkdown` to throw a `new Error('Chrome or Canary were not found')`.

I'm not sure if somebody somewhere might still have the old path so I kept it in there Justin Case. I can remove it if you think it best.