Coverage calculation is wrong

[henriquevcosta]

This repo isn't properly calculating coverage because the generic python module doesn't have any tests.
One option to fix this, which is the 'correct' way, is to create a new module 'test-reports' that has dependencies on all other modules and that runs a jacoco:aggregate-reports task (see here).

Another option is to add some unit tests on the module (which should be done anyway).

This issue may also be applicable to https://github.com/feedzai/feedzai-openml and https://github.com/feedzai/feedzai-openml-r.