Remove trailing blank space when beautify-json

before
<pre>
{
    "foo": "bar", 
    "hoge": "piyo"
}
</pre>

after
<pre>
{
    "foo": "bar",
    "hoge": "piyo"
}
</pre>

It's the same at first glance, but differences in  after the comma.

I think this JSON is more beautiful than the old one. What do you think?