pegjs/.github/PULL_REQUEST_TEMPLATE.md

Checklist:

• The change is trivial (if not, I filed an issue first)
• The change is split into atomic commits
• Commits have messages adhering to these conventions
• The change is documented (if needed)
• The change is tested (if needed)
• The change passes the specs (make spec)
• The change passes ESLint checks (make lint)