Include line numbers in output

I'd like to add a new `lineNumberRange` field to the output which will be useful in another project I'm working on (https://github.com/joshwnj/inline-docs).
Have a look at the `lineNumberFor` function. You could calculate:

`startLineNumber` & `endLineNumber` like:
```js
startLineNumber = lineNumberFor(match[0].index);
endLineNumber = lineNumberFor(matchIndex);
```

**This is untested code, so please test it**