Release 2.2.1

What's Changed

• Add a tray icon by @mathoudebine in #112
• Feature/new landscape theme with optional units by @mathoudebine in #124
• Add AUTHORS file and copyright notice to source files, as recommended by license by @mathoudebine in #128
• Add code quality CI checks by @mathoudebine in #129
• Add a bash-dark-green-gpu theme (for gpu support) and edit bash-dark-green by @Rollbacke in #127
• Fetch disk (partitions) data from psutil even with LHM enabled by @mathoudebine in #131

Full Changelog: 2.2.0...2.2.1