BREAKING CHANGE:
- remove built files from git repo.
- If you need to use the latest version of marked on the web you can use a cdn to get marked.min.js from npm:
- `https://cdn.jsdelivr.net/npm/marked/marked.min.js`
2. remove discount benchmark // not working on v0.8.x
3. add robotskirt benchmark
4. add target of bench in Makefile
5. add devDependencies in package.json