Re: [whatwg/fetch] Why doesn't `fetch` reject if 400 ≤ status < 600? (#18)

I prefer to do like this

```return new Promise((resolve, reject) => {
        fetch(url, {
            method: POST,
            headers,
            body: JSON.stringify(body),
        })
            .then((res) => {
                const response = res;
                const responsePromise = res.json();
                responsePromise
                    .then((data) => {
                        if (response.status >= 400) {
                            reject(data);
                        } else {
                            resolve(data);
                        }
                    })
                    .catch((error) => {
                        reject(error);
                    });
            });
    });
```

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