xfce-do-release: Update Appdata file
This adds the new release to the Appdata file if the <releases>
tag
exists. This file is only searched in the root of the repository and in
the data
directory, and must be unique.
I don't know if it's worth adding this by default (or silently?). I will personally use it for Mousepad after it is made available on Flathub (see apps/mousepad#146 (closed)).