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Since Netflix/bless#74 got merged and clients 7.8 have problems connecting to servers <7.8:
https://bugzilla.redhat.com/show_bug.cgi?id=1623929
https://bugs.archlinux.org/task/59838
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1790963
And that no solution seems to be on the horizon to resolve this backward compatibility issue, now might be the right time to support ed25519 key signing which, fortunately, is not very difficult on the client side.
This PR does not inclue suggesting that ed25519 should the default in README.md as this would be providing advice on the cryptographic methods.