I believe this is really trivial to any command line utility to have the ability to get the version.
I did not change the Assembly version (currently 0.0.0.0), but I believe the Inedo team can handle it in the next release of software (add the according Assembly version).
Our use case is that we have a tool that checks every installed tools for TeamCity agents for updates.
Without this PR, I would have to take the output of 'upack', select the version in the first row. Although that could work, I believe it is better to have a specific command for it. All the other tools (node, npm, dotnet cli, etc) has a `-v` or `-version`, therefore `upack version` seems appropriate.