Bot crashes after empty `/gateway/bot` payload instead of retrying

```
Discord Servers did not respond to 1 heartbeat within 41250ms but we're letting this one slip.
Discord Servers did not respond to 2 heartbeats  within 41250ms; aborting connection.
Reconnecting because "Discord did not acknowledge too many heartbeats" ...
Fetching gateway...
read: Host not found (authoritative) /gateway/bot with no body
 Failed.
```