[Twisted-Python] conch problem with ecdsa-sha2-nistp256 host key?

Hi, I filed this bug: https://twistedmatrix.com/trac/ticket/8931 At least for me, conch fails to parse a host key created by OpenSSH in ~/.ssh/known_hosts which is of type ecdsa-sha2-nistp256. Anyone have an idea as to how to fix this? -- Craig