This release adds support SHA2 signatureswith RSA keys in servers with SHA1 disabled (RFC8332)
It should fix the issues seen in issues #916 and #886.
For this, we are using a fork of x/crypto with two patches:
- ssh: add support for extension negotiation (rfc 8308)
golang/crypto#197 - ssh: use extension negotiation (rfc 8308) in ssh clients
rmohr/crypto@e4ed966