[travis] fix by running shellcheck still but not the setup scripts
[travis] fix by running shellcheck still but not the setup scripts

Fixed it the same way the alrra did in
https://github.com/alrra/dotfiles/issues/59

However, this does not fix the underlying issue with travis no longer
supporting sudoless osx images

wingy3181/dotfiles,wingy3181/dotfiles,wingy3181/dotfiles