Includes the possibility to instantiate an object with passing in only the mode. From this moment the logger can be used just as Serial. The Mqtt client and topic can be defined later on with the provided setters, and then the lib can log to a Mqtt broker.
Note: I mistakenly created tag v0.2.3 without updating the library description files. I then removed this tag again and with this release the tag will be recreated with these files properly included.