removed trailing whitespace

lib/mqtt.js

@@ -22,7 +22,7 @@ class MQTT {
             logger.debug(`Using MQTT client ID: '${mqttSettings.client_id}'`);
             options.clientId = mqttSettings.client_id;
         }
-	
+
         if (mqttSettings.selfsigned) {
             logger.debug(`Using Self Signed Cert. Ignoring warnings.`);
             options.rejectUnauthorized = false;