Update appveyor configuration (attempt #9)
Update appveyor configuration (attempt #9)

nukisman/elm-format-short,nukisman/elm-format-short,avh4/elm-format,nukisman/elm-format-short,nukisman/elm-format-short,nukisman/elm-format-short,avh4/elm-format,avh4/elm-format,avh4/elm-format