XDG_CURRENT_DESKTOP Environmental Variable Documentation

[Uthedris]

When I run the release version (0.6.1) with systemd on Linux Mint i get the error:

Dec 09 07:23:23 helce-aiwe satpaper[6848]: Error: An error occurred in the wallpaper updating loop
Dec 09 07:23:23 helce-aiwe satpaper[6848]: Caused by:
Dec 09 07:23:23 helce-aiwe satpaper[6848]:     0: Failed to get XDG_CURRENT_DESKTOP environment variable
Dec 09 07:23:23 helce-aiwe satpaper[6848]:     1: environment variable not found

I don't see anything in the documentation about this, so I tried setting:

Environment=XDG_CURRENT_DESKTOP=X-Cinnamon

It turns out that Cinnamon isn't supported, which is that OK as I can use the SATPAPER_WALLPAPER_COMMAND to trigger the update, but I wanted to let you that the XDG_CURRENT_DESKTOP should be added to the documentation