Compassion v2.0.0-alpha.8

• Fix Staccato import.
• Upgrade verbatim to 0.1.5.
• Upgrade staccato to 13.0.0-alpha.10.
• Build with Node.js 16 on Travis CI.
• Build with Node.js 16 on GitHub Actions.
• Upgrade interrupt to 11.0.0-alpha.23.
• Upgrade avenue to ^0.6.15.
• Upgrade keyify to ^3.0.0.
• Upgrade transcript to 0.1.5.
• Upgrade fastify to 3.19.2.
• Upgrade verbatim to 0.1.4.
• Upgrade staccato to 13.0.0-alpha.9.
• Upgrade extant to ^2.0.0-alpha.2.
• Upgrade destructible to 7.0.0-alpha.67.
• Upgrade perhaps to 0.0.11.
• Upgrade cubbyhole to ^4.0.5.

Closes #496.