Log Message:
py-more-itertools: updated to 8.4.0

8.4.0

* New itertools
    * :func:`mark_ends`
    * :func:`is_sorted`

* Changes to existing itertools:
    * :func:`islice_extended` can now be used with real slices
    * The implementations for :func:`filter_except` and :func:`map_except` were \ 
improved

* Other changes
    * Automated tests now enforce code style (using `black \ 
<https://github.com/psf/black>`__)
    * The various signatures of :func:`islice_extended` and \ 
:func:`numeric_range` now appear in the docs
    * The test configuration for mypy was updated