jinja2: add Python 3.7 and 3.9 (commit: 5bb65ef)
markdown: add Python 3.7 and 3.9 (commit: c97bad5)
psutil: add Python 3.7 and 3.9 (commit: 6dcad5c)
markupsafe: add Python 3.7 and 3.9 (commit: 5c84cc3)