fix in readme

readme.md

@@ -53,6 +53,9 @@ The attribute `nodes` finally contains the list of variables to be queried. It c
 
 In `flat` mode the final topic will be `${mqtt.publicTopicPrefix}/${opcua.name}/${opcua.node.ns}/${opcua.node.d}`
 
+
+## Example Output
+
 An example for the MQTT messages according to the above configuration in `flat` mode is:
 
     opcua/apl/0/pv {"serverName": "apl", "nameSpaceIndex": 0, "variableName": "pv", "value": 19.849281311035156}