Torguard support (#387)

See discussion on #374

internal/provider/provider.go

@@ -43,6 +43,8 @@ func New(provider string, allServers models.AllServers, timeNow timeNowFunc) Pro
 		return newPurevpn(allServers.Purevpn.Servers, timeNow)
 	case constants.Privado:
 		return newPrivado(allServers.Privado.Servers, timeNow)
+	case constants.Torguard:
+		return newTorguard(allServers.Torguard.Servers, timeNow)
 	default:
 		return nil // should never occur
 	}