new issue: Updates 3253 (DAV:error)

Hi,

RFC2518bis updates parts of RFC3253 (DAV:error below DAV:response) in an
incompatible way, and thus should note it in the front matter ("Updates: 
3253") and mention it as a change near the Changes Appendix.

(see <http://ietf.osafoundation.org:8080/bugzilla/show_bug.cgi?id=258>)

Best regards, Julian