Splitting on spaces gives an inflated estimation of time to read

On https://github.com/heyimjuani/minRead/blob/master/minRead.js#L28, use
```
return Math.ceil(text.split(/\s+/g).length / settings.wordsPerMinute) || 1;
```

instead to get a more accurate word count. Because `text()` may have multiple consecutive spaces in it, and when split, a bunch of empty elements are all counted towards the word count.