CLI does not import the right module

[lbeltrame]

Upon first installation of 1.6.0 (which, coincidentally, does not show up in the Releases here in GH), I got:

methylprep-cli -h
Traceback (most recent call last):
  File "/home/incalci/shared/conda-envs/methylsuite/bin/methylprep-cli", line 5, in <module>
    from methylprep.cli import app
ImportError: cannot import name 'app' from 'methylprep.cli' (/home/incalci/shared/conda-envs/methylsuite/lib/python3.10/site-packages/methylprep/cli.py)

It looks like app was renamed cli_app.