upstream libxslt patches

[Mike Dalessio]

Hi all,

Canonical updated their libxslt package today with a set of security-related patches that we may end up backporting into Nokogiri and releasing soon.

Details are in this github issue:

    https://github.com/sparklemotion/nokogiri/issues/1634

Please do not reply to this email; instead please comment on the github issue if you'd like to participate in a discussion.

Cheers,

-m