Quick notes on how to wait 24-48 hours before assigning (copied from my Slack message)

> Quick notes while I'm brainstorming.

> 1. Use GitHub api to pull all PRs on JuliaLang/julia that are LESS than M days old for some value of M. E.g. M=30. If we are smart about our query parameters, we can make it so the number of GitHub api calls we need is low, and the number of results is also low.
> 2. Exclude PRs where the PR author is a committer.
> 3. For each PR:
> a. Check how old the PR is. If PR is less than N days old, we are done. Set e.g. N = 3 or 4 days. Or even N = 7 days. N must be less than our search/lookback period M.
> b. Check if PR has assignee. If PR does have assignee, and if assignee is committer, then we are done.
> c. Grab username of all people commenting on PR. If any of those people are a committer, we are done
> d. Grab username of all people that have left review on PR. If any of those people are a committer, we are done.
> e. If none of the above have been satisfied, then pick a random person from https://github.com/JuliaLang/pr-assignment and assign them. At this point, I think the bot should also post a comment that username-pings the assignee, so that they become more aware that they've been assigned.

Run this as a cron job, e.g. every 24 hours.