tonyfinn [1] filed an orphan request for acme-dns [2]: Last updated in 2018, flagged out of date since May 2019, 2 versions behind the current stable version (0.8, released October 2019: https://github.com/joohoi/acme-dns/releases )
[1] https://aur.archlinux.org/account/tonyfinn/ [2] https://aur.archlinux.org/pkgbase/acme-dns/