v0.18.0

What's Changed

• test: markdown comment shell-boundary coverage incl. real PowerShell by @nicholasbester in #123
• fix: --due-date YYYY-MM-DD resolves to local noon, not midnight UTC (#126) by @nicholasbester in #128
• release: v0.18.0 by @nicholasbester in #129

Full Changelog: v0.17.0...v0.18.0