Add support for new quantum-resistant key exchange

[jtesta]

According to the release notes for OpenSSH 8.0 (https://www.openssh.com/releasenotes.html), a new quantum-resistant key exchange algorithm was implemented:

 * ssh(1), sshd(8): Add experimental quantum-computing resistant
   key exchange method, based on a combination of Streamlined NTRU
   Prime 4591^761 and X25519.

[TheScriptGuy]

I second this request 👍 Is there a possibility to get this feature?

[jtesta]

This project has been inactive since 2017. However, I forked it over four years ago and continued development. Lots of new features have been added, including support for this quantum key exchange: https://github.com/jtesta/ssh-audit