Bot should rescrape election page for winners during election end

[samliew]

Right now, the bot only checks elections for changes every scrapeIntervalMins minutes (default: 5).

This means when an election ends, the bot could take an additional 5 minutes to announce the winners.

This should be automated to rescrape 30 seconds (or a period allowing for tallying of votes) following the end of the election since SO has automated the elections.

This may complicate #60

[samliew]

Tested on academia's election, results took 14min to announce

[Oaphi]

Tested on academia's election, results took 14min to announce

yeah, that's a bit on the high end - I see your PR already addresses that, nice! Do we have any way to know if the election ended live, btw? I assume we don't, but maybe worth looking into since SE is going the automation route with elections.