1.4-stable: add a link to a mail posted on 14 Jan 2013 about Rails 2.3 CVE-2013-0155

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/1.4-stable@11208 e93f8b46-1217-0410-a6f0-8f06a7374b81