convert chn labels from list to array

[OleBialas]

Added list-to-array conversion in ransac.find_bad_by_ransac test to test_find_bad_by_ransac.
closes #116

[sappelhoff]

did you follow the steps described here? --> https://numpy.org/doc/stable/reference/generated/numpy.asarray.html

else you'll have to install black, flake8, isort, etc. and manually run them on your changes to make sure that the codestyle complies with the rest of the library

[OleBialas]

I agree that using np.asarray is better

[sappelhoff]

please also add yourself here: https://github.com/sappelhoff/pyprep/blob/master/.zenodo.json

and add an entry to the changelog: https://github.com/sappelhoff/pyprep/blob/master/docs/whats_new.rst

[OleBialas]

Done

[sappelhoff]

Thanks @OleBialas

[OleBialas]

My pleasure, thanks for inviting me to contribute