This just lists the user-visible changes. The real change log is the
git log, q.v.

20250511 bkw: 0.3.0 release. Changes since 0.2.0:

- New -p option (startup delay).
- Print /sys path to input device when debugging.
- USB vendor ID, product ID, and default device node are now
  configurable at compile time.
- marsond no longer appears as a pointing device in xinput --list.

20250507 bkw: 0.2.0 release. Changes since 0.1.x:

- marsond now always exits cleanly, even if killed by SIGTERM.

Anything before 0.2, see the git log for changes.