Feature Request: Add support for urlscan

[Soundtoxin]

I was just trying to set up tmux-urlview on my machine running Guix System when I noticed that neither urlview nor extract_url were packaged for guix, but urlscan[0] was. urlscan calls itself a replacement for urlview, so I'm wondering if it could be supported by tmux-urlview in addition to the other options.
[0] https://github.com/firecat53/urlscan

[ryuheechul]

linking two existing PRs for visibility:

• Allow using an arbitrary program instead of urlview, with command-line args #32
• add urlscan compatibility #27