[whatwg/url] Encode ^ in pathname (#607)

```js
u = new URL('http://abc.com/a^b');
console.log(u.pathname);
```

This gives "a%5Eb" in Chrome and Firefox, in addition to Go and Node.js. Ruby's `URI` fails to parse the URL with `^`, but is fine with %5E. However, the spec and Safari don't escape `^` at the moment.

Shall we escape `^` in paths? This will cause U+005E (^) to be moved from the userinfo set to path set.

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