[racket] didn't know HN used Racket

BTW HN is up now.

> On Nov 7, 2014, at 13:51 , Geoffrey S. Knauth <geoff at knauth.org> wrote:
> 
> I visited HackerNews [1].  Unfortunately it was down, but you can following @HNStatus on Twitter.  In that feed, I saw:
> 
> 12h ago:  Quick system reboot to update kernel, HN code, and Racket runtime. Be back soon.
> 11h ago:  Now for Racket update.
> 11h ago:  All done.
> 
> [1] https://news.ycombinator.com/
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