Update repo url (and hello!)

[patcon]

Hello! I'm working with EDGI on a related project in this space, and while doing a survey of other tools, we came across Pagelyzer :)

We're totally open to further interaction, but for now, I just wanted to say "hi" -- Hi! -- and point out that the url of the repo is a dead link, and presumably should be http://pagelyzer.openpreservation.org/

Anyhow, all the best! (If anyone is interested, help or feedback on that list/survey would be totally appreciated! Just let me know, and I'm happy to add you as collaborators on the repo.)