Scheduled date for 3.2 released pushed to April 6th.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1463701 13f79535-47bb-0310-9956-ffa450edef68
Updated release notes with latest bug fixes.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1463702 13f79535-47bb-0310-9956-ffa450edef68