Update changelog

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1643707 13f79535-47bb-0310-9956-ffa450edef68
Merged revision 1643675 from tomcat/trunk:
It is not necessary to handle MalformedURLException separately as it extends IOException.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1643709 13f79535-47bb-0310-9956-ffa450edef68