[ANNOUNCE] dbus-broker v20

[David Rheinsberg]

Hi

We just pushed out the v20 release of dbus-broker. This release
updates the logging infrastructure of the launcher and hopefully
improves the usefulness of the messages printed to the journal.

Please let us know of any issues.

https://github.com/bus1/dbus-broker/releases/tag/v20

## CHANGES WITH 20:

* Major improvements in the logging infrastructure of the launcher.
Messages are now directly forwarded to the journal and amended with
additional fields. The journal-catalog now contains entries with
background information on runtime log messages. Lastly, many of the
log-messages were overhauled to be more descriptive.

* The `c-sundry` submodule was dropped and replaced by `c-stdaux`. This
is a much smaller project with a clearly stated goal. The old dumping
gound `c-sundry` is no longer needed (remaining bits were moved into
the dbus-broker codebase).

Contributions from: David Herrmann, Tom Gundersen

- Tübingen, 2019-04-10