[Feature request] Add hostname of a nick when join channel

When join in a channel i use:

```javascript
client.addListener('names', (channel, nicks) => ...);
```

But nicks is an array with names only and options (`+` or `@`), but if need hostname of each nick need send a whois for each nick. The idea is the client send the hostname or same structure as `join` event or call `join` event for each nick when join to a channel.