Release Arguable version 13.0.0-alpha.3.
Release Arguable version 13.0.0-alpha.3.

 * Upgrade `interrupt` to `11.0.0-alpha.21`.
 * Upgrade `rescue` to `7.0.0-alpha.15`.
 * Build with Node.js 16 on Travis CI.
 * Build with Node.js 16 on GitHub Actions.

Closes #319.

bigeasy/arguable