library depends on old dnsjava version; should be updated

The id4me relying party library depends on an ancient version of DNSjava (2.1.7). When it us used in a project requiring a newer version, it won't work as the signature of the getSectionRRsets method has changed. I'm attaching a patch (git-diff.txt, git diff output) that fixes the issue by depending on dnsjava 3.3.1 and making Id4meResolver use the changed method.