v0.17.1

Oriel 0.17.1

Added

• System monitor example: the version in the header and Check for
  updates next to Settings, with oriel.updater. Each release attaches a
  signed system-monitor-latest.json; a copy updates from its own entry
  (its renderer, an executable, the AppImage or the macOS .app), and a
  deb/rpm copy says a new version is out. The monitor now has Oriel's
  version instead of 0.1.0.

Changed

• System monitor example: the Oriel renderer is the default
  (-Drenderer=oriel), and the release packages (AppImage, deb, rpm,
  Windows installer and zip, macOS .app) use it.