[JOSS] - Python snippet in README

[fnattino]

When running the second Python snippet from the README file, I get the following error:
AttributeError: module 'thermohubclient' has no attribute 'setDatabaseConnectionFilePath'.

If I comment out the first line, I still get the following:
AttributeError: 'thermohubclient.PyThermoHubClient.DatabaseClient' object has no attribute 'recordsFromThermoDataSet'.

Minor point: it would also be nice to inform that thermohubclient needs to be installed as a separate dependency to run these examples.