fixed changelog for 2.0 release according to what discussed on ML
fixed changelog for 2.0 release according to what discussed on ML

git-svn-id: a66ef3f0e6c00b14098e182847b4bd646263fa09@1097533 13f79535-47bb-0310-9956-ffa450edef68

apache/commons-pool,apache/commons-pool,apache/commons-pool