Add changelog entry for r1539177
This change was in 7.0.48.
https://issues.apache.org/bugzilla/show_bug.cgi?id=55735

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1563532 13f79535-47bb-0310-9956-ffa450edef68