3.2.0
- Add `mdd undo` — reverts the last change made through mdd; run it again to redo (toggle behavior).
- Add `mdd update` — installs the latest release via `go install`.
- Fix the Go module path (`i-am-fran/markdowndo` → `i-am-fran/markdown-do`), which never matched the actual repo and silently broke `go install`/`go get`.
- Finish the MarkdownDO → Markdown-do rebrand.