Shouldn't [`blockMOM`](https://github.com/scikit-learn-contrib/scikit-learn-extra/blob/a6569b20bfaff619b18a27eb27f2d01106c1fd85/sklearn_extra/robust/mean_estimators.py#L9) be renamed to `block_mom` (or in its full name) in order to be pep8 compliant? cc @TimotheeMathieu