Fix Jute version info

[fjarri]

Pkg3 doesn't seem to support getting your own version at the moment (see this issue), so currently in the logs Jute version is replaced by <undefined>. Need to fix when the way of getting the version is clear.

[Seanny123]

Seems resolved to me. I get a proper version number when I run Pkg.installed().

[fjarri]

There were problems with getting the version this way, because at the moment the package had a Project.toml, and apparently in that case the version of the package itself is not included in the list. The Pkg issue is still open, so I guess they haven't yet decided on the proper API. But installed() does work for me now, so I suppose there's no harm in trying to get the version there.