Shortly after ns-3.30 was released, we became aware of a Wi-Fi
performance regression that has now been fixed in the mainline. Tommaso
was also testing ns-3-dev on the forthcoming macOS 10.15 release and
found and fixed some issues.
Since there have been no new features added since release, I have
branched from the tip of ns-3-dev to create an ns-3.30.1 release
candidate that I would like to publish as an update to ns-3.30. It
contains these fixes as well as a couple of others that have been
committed since that time.