Update README to mention VSCode
Update README to mention VSCode

This should take care of #176.
avh4/elm-format,nukisman/elm-format-short,nukisman/elm-format-short,nukisman/elm-format-short,nukisman/elm-format-short,nukisman/elm-format-short,avh4/elm-format,avh4/elm-format,avh4/elm-format