Log Message:
3.4.0:

You can view the `3.4.0 milestone`_ on GitLab for more details.

- Refine logic around ``--select`` and ``--ignore`` when combined with the
  default values for each.

- Handle spaces as an alternate separate for error codes, e.g.,
  ``--ignore 'E123 E234'``.

- Filter out empty select and ignore codes, e.g., ``--ignore E123,,E234``.

- Specify dependencies appropriately in ``setup.py``

- Fix bug in parsing ``--quiet`` and ``--verbose`` from config files.

- Remove unused import of ``os`` in the git hook template