v1.0.2

Download Gibson.saver.zip, unzip it and double click Gibson.saver.
Choose whether to install it for yourself or for everyone, then open
System Settings, go to Wallpaper, click Screen Saver…, set Use
Screen Saver to Custom and pick Gibson at the bottom.

The bundle is signed with a Developer ID and notarised by Apple, so
macOS opens it without any extra steps. Screenshots of every dialog
are in docs/INSTALL.md.

Full Changelog: v1.0.1...v1.0.2