listarchives will now update every hour

[Josip Rodin <joy@cibalia.gkvk.hr>]

Hi,

I've been reminded about the fact lists.d.o updates only ever 8 hours, so I
checked the logs. It appears that the update process never takes more than a
few minutes, so I've made it run every hour. If all goes well (if no new
bottlenecks appear), I'll make that every half an hour or 20 minutes.

-- 
     2. That which causes joy or happiness.