Prepare release 0.4.0 (#97) * Prepare release 0.4.0 * Update CHANGELOG.md * update .changes/v0.4.0.md * Lightly revise --allow-delete help text and naming * Revise CHANGELOG-use simpler text and active voice * Update v0.4.0.md --------- Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>