No newline at eol in formatted notebooks

[weery]

We use the new black formatting in databricks notebooks which adds a newline at the end of each notebook. We also use blackbricks in our CI/CD pipeline to check for formatting issues. To make sure that our CI/CD passes we tend to checkout our changes locally just to run blackbricks locally before we run our pipeline, which is quite tedious.

A potential fix #36

[weery]

Another way of handling this while keeping backwards compability would be to add a CLI option defaulting to current master, see #38