Ping 0ms

Hello.
For some reason i see 0ms when testing any server
```
root@le1mp3-1-10:~/SpeedTest# SpeedTest --output json --test-server librarian.comstar.ru:8080
{"client":{"ip":"xxx","lat":"60.1695","lon":"24.9354","isp":"magnacapax"},"server":{"host":"librarian.comstar.ru:8080"},"ping":"0","jitter":"0","download":"796981719.812223","upload":"694566804.911060","_":"all ok"}
```