IPv6 URL's not parsed correctly, however IPv4 are

```sh
❯ node
Welcome to Node.js v12.18.0.
Type ".help" for more information.
> const { fromUrl, NO_HOSTNAME } = require('parse-domain');
undefined
> fromUrl('1.2.3.4/host')
'1.2.3.4'
> fromUrl('::af/host')
Symbol(NO_HOSTNAME)
> fromUrl('1234:1234:123:21::21/host')
Symbol(NO_HOSTNAME)
>
```