i/o timeout retries

A user was having issues with tcp tials and i/o timeouts, those could maybe be handled more gracefully by go-twitch-irc and retry better. 

```
time="2021-04-08T06:55:29Z" level=fatal msg="dial tcp: lookup irc.chat.twitch.tv on 10.1.1.1:53: read udp 172.17.0.13:54853->10.1.1.1:53: i/o timeout"
```

Reference Issue: https://github.com/gempir/justlog/issues/96
