Release Rescue 6.0.1.
Release Rescue 6.0.1.

 * Add badges to `README.md`. Closes #36.
 * Build with Actions, ship coverage to Codecov. Closes #35. Closes #34.
 * Tidy `.gitignore`.
 * Revert test to Proof. Closes #33.

Closes #37.

bigeasy/rescue