u2f / libfido2 version

[Sean Liao]

Hi,

So I finally have time to test the u2f support
but so far I haven't been very successful,
Specifically, current HEAD has
SSH_SK_VERSION_MAJOR           0x00040000
and I can't seem to find a matching libfido2 version,
current HEAD of Yubico/libfido2 is 0x00020000

Is there a more up to date libfido2
or a particular commit of openssh-portable
I should be using?

thanks

Sean