post_upgrade() {

    # return if old pkgver <= 1.4.3-1
    [[ $(vercmp $2 1.4.3-1) -le 0 ]] && return

    echo "---------------------------------------------------------------------
    stone-soup-yiuf saves have moved to ~/.yiufcrawl.
    If you want to keep your old saves, move ~/.crawl-yiuf to
    ~/.yiufcrawl.
---------------------------------------------------------------------"
}