[fetch] Not delete, the hash url in Request and Response (#214)

Removing `hash` of URL, it prevents to use history API:
```javascript
fetch("url#hash").then((response) => history.pushState(null, null, response.url))
```

The server redirect, `response.url` needed use, that correct display url in address bar.
I do propose to not delete the `hash`, it will be more convenient in practice.

`Request.url` and `Response.url` should be similarly `location.href` (within `hash`)

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Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/issues/214