Update requested for Ubuntu 22.04

[henry88g]

The packaged libstdc++.so.6 is incompatible with /lib/x86_64-linux-gnu/libproxy.so.1. GLIBCXX is only up to GLIBCXX_3.4.28 in the appimage, but /lib/x86_64-linux-gnu/libproxy.so.1 seems to require 29 (at least).

I suppose if the Appimage offered an option to use system libraries, instead of packaged ones, it might work, but that would go against the Appimage concept...??

The effect is that you can't load files for compression.

I have been using the application on Ubuntu 22.04, and would like to continue to do so, but I do understand that this is a side-project, and not high priority.