Add more stats

[brettatoms]

From Hacker News:

It would be helpful to see some additional stats, like the number of issues and the last update. Of course, these are only heuristics, but they are still helpful to see. It's often pointed out that one of the great things about Clojure is that the libraries generally don't need updating that often because the language is pretty stable. However, quite often I do find that libraries have a number of long open issues or depend on outdated, sometimes insecure, versions of Java libraries. I realise that I'm complaining about free code, so 'fork it and contribute' is a valid response, but at the risk of further fragmentation and yet another library that exists for just a short period.

[wlkr]

Thanks for opening this @brettatoms!