Update change log for 1.5.0 and 1.3.11. * CHANGES (1.5.0): Rename from 1.4.0, update contents. (1.4.0): Annotate "Not released". (1.3.11): Add draft changelog with some pending backports. git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1935056 13f79535-47bb-0310-9956-ffa450edef68