Update notes for submitted changes

* pgm: add missing optional dependency to org.tukaani:xz

76/b3781f4b9d9bce83ce81886851b90e486c34fb

+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-at: Sun, 16 Jun 2019 19:16:32 -0400
+Reviewed-on: https://git.eclipse.org/r/144164
+Project: jgit/jgit
+Branch: refs/heads/stable-5.4