hardcoded system-specific NetworkManager path
pipenv run liberty tunnel-setup on Arch prompts me for my username and password, but then fails with "gi.repository.GLib.Error: nm-vpn-plugin-error-quark: cannot load plugin "/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-vpn-plugin-openvpn.so": /usr/lib/x86_64-linux-gnu/NetworkManager/libnm-vpn-plugin-openvpn.so: cannot open shared object file: No such file or directory".
I do however have what looks like the missing object file at the path
/usr/lib/NetworkManager/libnm-vpn-plugin-openvpn.so (which is installed on Arch by the
networkmanager-openvpn package). Looks like the path might differ between distributions.