Feature: filter by hostname for PureVPN servers

- Record support for TCP and UDP for each hostname
- Fix: each hostname supports only TCP or UDP, not both
- Update PureVPN server information

internal/configuration/purevpn.go

@@ -17,6 +17,10 @@ func (settings *Provider) purevpnLines() (lines []string) {
 		lines = append(lines, lastIndent+"Cities: "+commaJoin(settings.ServerSelection.Cities))
 	}
 
+	if len(settings.ServerSelection.Hostnames) > 0 {
+		lines = append(lines, lastIndent+"Hostnames: "+commaJoin(settings.ServerSelection.Hostnames))
+	}
+
 	return lines
 }
 
@@ -48,5 +52,10 @@ func (settings *Provider) readPurevpn(r reader) (err error) {
 		return err
 	}
 
+	settings.ServerSelection.Hostnames, err = r.env.CSVInside("SERVER_HOSTNAME", constants.PurevpnHostnameChoices())
+	if err != nil {
+		return err
+	}
+
 	return nil
 }