Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56526
Followup to r1595331: correct version number in changelog.
(Tomcat 8.0.8 has been tagged an hour earlier).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1595359 13f79535-47bb-0310-9956-ffa450edef68