Nameservers should be lowercased
Nameservers should be lowercased

fixes:
```
nameserver NS-AZURE.NONO.IO.'s NS records match whois's ["NS-AZURE.NONO.IO.", "NS-AWS.NONO.IO.", "NS-HE.NONO.IO.", "NS-GCE.NONO.IO."] (FAILED - 1)
```

cunnie/sslip.io,cunnie/sslip.io,cunnie/sslip.io,cunnie/sslip.io