Increase number of PRs scanned per repo to cope with Frontend pace of dev
Increase number of PRs scanned per repo to cope with Frontend pace of dev

These PRs by @katebee were not fully updated by Prout:

* https://github.com/guardian/frontend/pull/15460
* https://github.com/guardian/frontend/pull/15465

The PRs were marked as 'Pending' but not 'Seen', because Prout was only
examining the 10 most-recently updated PRs (note that the only available sort options are
`created`, `updated`, `comments` - https://developer.github.com/v3/issues/
) - it does this to avoid burning through GitHub API quota too quickly.
On Frontend, the pace of development is such that by the time @katebee's
PRs had been deployed, more than 10 other PRs had been merged or
commented-on - so Prout never scanned or updated Kate's PRs from that point
onward.

This change now looks at the 30 most recently updated PRs, of the PRs that
have been updated in the last 14 days. This means that for very busy repos
like guardian/frontend it _will_ consume more GitHub API quota, but for
repos that change less frequently, we still won't be expending quota on
'old' PRs.

Hopefully we won't bust the 5000 per hour quota limit!

guardian/prout