ShowPlayers doesn't return the full response

```
tsuzu@Tsuzus-MacBook-Pro ~ % rcon -a "10.23.0.1:30970" -p "..." -T 1s ShowPlayers
name,playeruid,steamid
...
cli: execute: rcon: read tcp 192.168.1.67:62095->10.23.0.1:30970: i/o timeout
```

The response of ShowPlayers drops the last 10~ bytes.
The server seems to forget to flush the stream....

As a workaround, I ignored steam id.