Added install of setuptools in ci

  stage: test

  image: python:latest

  script:  # All pytests fail with ModuleNotFoundError: No module named 'test'

    - pip install pytest

    - pip install pytest setuptools

    - pip install --editable ".[cron-description,cron-schedule]"

    - pip list

    - python setup.py test

  stage: test

  image: python:latest

  script:  # With `&> /dev/null` in `./coverage.sh` everything appears green but...

    - pip install coverage pytest

    - pip install coverage pytest setuptools

    - pip install --editable ".[cron-description,cron-schedule]"

    - ./coverage.sh