GitHub seems to be rate-limiting requests, and we're now getting a lot of results like:

URL        `https://github.com/bids-standard/bids-specification/pull/13'
Name       `#13'
Parent URL file:///root/build/site/CHANGES.html, line 1067, col 41
Real URL   https://github.com/bids-standard/bids-specification/pull/13
Check time 0.397 seconds
Size       1KB
Result     Error: 429 too many requests

See, for example, https://app.circleci.com/pipelines/github/bids-standard/bids-specification/1076/workflows/7acda833-9ecf-4c1a-a6f7-51f45641fbc1/jobs/2434.

We're running it twice, though I don't understand the explanatory comment:

@yarikoptic Any thoughts? Maybe we can adjust the commands to ensure there's no duplication? If linkchecker could output a list of targets that could be combined and deduplicated, that might be a useful approach.