Added the missing pytest-cov dependency for the actual pytest library

khrurequested to merge
khru/testing_python:pre_assignment into pre_assignment

When running the pipenv run pytest_report you get an error message.

 pipenv run pytest_report
Courtesy Notice: Pipenv found itself running within a virtual environment, so it will automatically use that environment, instead of creating its own for any project. You can set PIPENV_IGNORE_VIRTUALENVS=1 to force pipenv to ignore that environment and create its own instead. You can set PIPENV_VERBOSITY=-1 to suppress this warning.
Warning: Your Pipfile requires python_version 3.9, but you are using 3.8.10 (/home/e/.local/share/v/t/bin/python).
  $ pipenv --rm and rebuilding the virtual environment may resolve the issue.
  $ pipenv check will surely fail.
Loading .env environment variables...
ERROR: usage: pytest [options] [file_or_dir] [file_or_dir] [...]
pytest: error: unrecognized arguments: --cov=preassignment/src --cov-report --cov-branch
  inifile: None
  rootdir: /home/e/projects/plp/testing_python

To prevent this error you need to install pytest-cov

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