We're still within the 3 years and 2 months range. I opted to only
reduce this number by 15 instead of 25 because this change will mark
18 issues as stale rather than about 35.
We need to keep reducing this number, but we also don't want to flood
this process too much.
This config file enables the [probot-stale](https://github.com/probot/stale/)
bot to comment on stale issues. We're starting off with issues
that have become stale after approximately 3 years and 6 months.
This value is configured in the `daysUntilStale` setting.
This ensures the file displays correctly on GitHub. This also fixes a
few minor typos and the format of the Vim modeline, which wasn't being
detected previously.
The most "important" change here is to remove the checkboxes for
"Tests Written" on the pull request template. Because they're checkboxes
rather than radio buttons, no matter which one you checked it would show
"1/2 complete" for any references to that PR in other issues.
