see http://apple.stackexchange.com/questions/238179/brew-how-to-delete-outdated-version-of-package

fullbrewupdate.sh

    fullBrewUpdate(){
            brew update
            brew cask update

            casks=( $(brew cask list) )

            for cask in ${casks[@]}
            do
                # in the first line there is version
                    current="$(brew cask info $cask | sed -n '1p' | sed -n 's/^.*: \(.*\)$/\1/p')"

                    installed=( $(ls /opt/homebrew-cask/Caskroom/$cask))
                    if (! [[ " ${installed[@]} " == *" $current "* ]]); then
                            (set -x; brew cask install $cask --force;)
                    fi
            done

            brew upgrade
            brew cleanup
    }