Release Staccato version 12.0.7.
Release Staccato version 12.0.7.

 * Upgrade `interrupt` to `11.0.0-alpha.16`.
 * Upgrade `comeuppance` to `0.0.1`.
 * Replace Prospective with Eject and Comeuppance.
 * Add `unlisten()` to redux.
 * Update `LICENSE` for 2021.
 * Remove `sudo` from `.travis.ci`.

Closes #129.

bigeasy/staccato