Update ua.txt
Update ua.txt

```The user-agent is hardcoded in the script as "Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36 OPR/54.0.2952.64,"```
stamparm/maltrail,stamparm/maltrail,stamparm/maltrail,stamparm/maltrail