This port will be removed on 2020-12-31 if not fixed
Where is branch with python3 support: https://github.com/sk1project/uniconvertor/tree/py3
But it isn't ready yet: https://github.com/sk1project/uniconvertor/issues/19
This PR is related with: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249698
Dropped maintainership, no longer interested in this port. There were no releases for a decade, and py3 migration is still not complete, so I'd consider this an abandonware and suggest port removal right away.