Add CHANGELOG.md

Author: stringparser

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [5.0.1] - 2026-02-07
+
+### Added
+
+- **Tests:** New `test/api.test.ts` with coverage for invalid inputs (`set`/`get` with non-string), no-match behavior (`get` returns `null` when no route matches), and edge cases.
+
+---
+
+## [5.0.0] - 2026-02-07
+
+Major release: TypeScript migration, modern tooling, and CI updates.
+
+### Added
+
+- **TypeScript:** Library rewritten in TypeScript; source lives in `src/`, built output in `dist/`. Type definitions shipped via `types` in `package.json`.
+- **TypeScript usage:** README and example updated to ESM + `import Parth from 'parth'`. Documented type imports: `ParthOptions`, `ParthResult`.
+- **CI:** GitHub Actions workflow (`.github/workflows/ci.yml`) replacing Travis. Runs `dist`, `lint`, `test`, and `verify:publish` on Node 20, 22, and 24.
+- **Publish verification:** `verify:publish` script and `test/verify-publish/` (pack, install in a consumer project, run smoke test). Runs automatically after `npm test` via `posttest`.
+
+### Changed
+
+- **API surface:** Default export is the `Parth` class (constructor). No behavioral change from v4 for valid usage.
+- **Entry point:** `main` is now `dist/index.js` (compiled from TypeScript). `files` in `package.json` limited to `dist`.
+- **Example:** `example.js` replaced by `example.ts` (ESM, TypeScript). Removed the `-l` listing of internal properties.
+- **Linting:** ESLint flat config (`eslint.config.mjs`). Config files renamed to `.mjs` (e.g. `jest.config.mjs`).
+- **Testing:** Mocha replaced with Jest; tests in `test/**/*.test.ts`.
+- **Engines:** Node.js requirement raised to `>=20` (from `>=14`). CI tests on Node 20, 22, and 24.
+- **CI branch:** Workflow runs only on `main` (no longer `master`/`main`).
+
+### Removed
+
+- **Travis CI:** `.travis.yml` and Travis badge from README.
+- **Legacy JS:** `index.js`, `lib/util.js`, and `.eslintrc` removed in favor of TypeScript and new ESLint config.
+- **Dependency:** `lodash.merge` removed; implementation uses `lodash.clonedeep` only.
+- **README:** “parth properties” section (e.g. `store`, `regex`) replaced by a short TypeScript section; “todo” section removed.
+
+### Fixed
+
+- **package.json:** `engines` field corrected from a string to a proper object (`"node": ">=20"`).
+
+---
+
+## [4.2.3] and earlier
+
+See git history for changes prior to the v5.0.0 TypeScript migration (e.g. `git log -p` on older tags).
+
+[5.0.1]: https://github.com/stringparser/parth/compare/v5.0.0...v5.0.1
+[5.0.0]: https://github.com/stringparser/parth/compare/v4.2.3...v5.0.0