v0.4.0

Bugfix release.

What's Changed

• try to build for LMDE5, Debian11 and cross-build for macOS by @efa in #160
• added Debian 12 to debianize.sh by @efa in #172
• makeAppImage.sh : create portable/cross-distro Linux packages by @efa in #173

Full Changelog: v0.3.9...v0.4.0