HTTPCORE-91: updated release notes
HTTPCORE-91: updated release notes

git-svn-id: 9689f759f60f1118327eab294c99d759009aaa48@555990 13f79535-47bb-0310-9956-ffa450edef68

apache/httpcore,ok2c/httpcore,alinvasile/httpcore,bimargulies/httpcore,apache/httpcore,bimargulies/httpcore,alinvasile/httpcore,apache/httpcomponents-core