updated changelog.txt

git-svn-id: http://svn.code.sf.net/p/dynamicreports/code/trunk@746 bf0c503b-2351-4f66-9eae-aa52f3279a3f
[maven-release-plugin] prepare release dynamicreports-3.1.4

git-svn-id: http://svn.code.sf.net/p/dynamicreports/code/trunk@747 bf0c503b-2351-4f66-9eae-aa52f3279a3f
[maven-release-plugin] prepare for next development iteration

git-svn-id: http://svn.code.sf.net/p/dynamicreports/code/trunk@749 bf0c503b-2351-4f66-9eae-aa52f3279a3f