Failing test

Sometimes newlines are stripped out when they shouldn't be:
https://github.com/yize/html-minify/issues/2
Don't completely remove non-space whitespace

This can lead to markup like:
```html
<a href=exmaple.com>This is
a test</a>
```

Minifying to:
```html
<a href=example.com>This isa test</a>
```

Instead of:
```html
<a href=example.com>This is a test</a>
```

Fixes https://github.com/yize/html-minify/issues/2
Merge pull request #3 from losingkeys/removes-newlines-when-it-shouldnt

Bugfix: Removes newlines when it shouldn't