New version 3.0 with MQTT Broker backend

In this new release I added support to write all values from the boiler to an MQTT broker.

I've also added support to Home assistant MQTT Discovery so in case you are using that integration the device and some entities will appear just there.

Note, you can configure what you want to see modifying the diematic.yaml file and restarting the service.

Full Changelog: v2.2...v3.0