fix for new flatpak versions
I could not get the scripts to work with flatpak
1.10.2 due to parsing errors.
I updated the code to use the
--columns option introduced in flatpak
1.1 and could get the example in Readme.md to run. I also updated the gnome-nightly flatpak repo and the nautilus git repository.
Let me know if there is interest in merging these patches.