yaml paramener file is not loaded by the cli of papermill v. 2.4.0

## 🐛 Bug

The yaml parameter file is not loaded by the cli of papermill v. 2.4.0

To solve the bug, one needs to  change line 240 n papermill/cli.py
as
`
        with open(params) as ff:
`
`
            parameters_final.update(yaml.load(ff, Loader=NoDatesSafeLoader) or {})
`
(cannot make the right indent.