The doc is now on par with the JSHint specs

Yeah, I should have updated the README file in #13. It created a lot of confusions, and pull request #21 came along.

Although @victorporof later [commented](https://github.com/victorporof/Sublime-JSHint/pull/21#commitcomment-3686657) that we can find a compromise between the two. In the meanwhile, since the proposed changes have not been merged yet, I think this pull request is still relevant.