Remove trailing blank space when beautify-json

before
{
    "foo": "bar",
    "hoge": "piyo"
}

after
{
    "foo": "bar",
    "hoge": "piyo"
}

It's the same at first glance, but differences in  after the comma.
Merge pull request #12 from narusemotoki/develop

Remove trailing blank space when beautify-json