[whatwg/fetch] fetch filter the symbols (#331)

```
    // body
    const body = raw_list.join('&');

    // header
    const headers = new Headers();
    headers.set('Content-Type', 'application/x-www-form-urlencoded');
    headers.set('Accept', 'application/json, text/javascript, */*;');
    const fetch_options = {
        method: 'POST',
        headers,
        body,
        credentials: 'include'
    };
    
    // fetch
    fetch(api_uri, fetch_options)
```

The body lookes like this before fetching:

> a=1&b=5p7zv9+5M7

But, my server got this:
> a=1&b=5p7zv9 5M7

It replace the **+** with a space.I use the Jquery.ajax and send the same data,the server got the right thing with **+**.
So how can I avoid the **+** to be replaced

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