remove coverage argument from pytest addopts config

[alisterburt]

When running pytest locally I get

(dask-ctl) ➜  dask-ctl git:(main) pytest                    
ERROR: usage: pytest [options] [file_or_dir] [file_or_dir] [...]
pytest: error: unrecognized arguments: --cov=./
  inifile: /Users/aburt/Programming/dask-ctl/setup.cfg
  rootdir: /Users/aburt/Programming/dask-ctl

this PR solves the issue for me but might break anything you do with the coverage results

I'm also not sure why this runs on CI/for you but not for me...

[jacobtomlinson]

Are you installing the test dependencies? The --cov flag is added by the pytest-cov package.

https://github.com/dask-contrib/dask-ctl/blob/main/requirements-test.txt

[alisterburt]

missed that file, my bad!

[jacobtomlinson]

Be sure to checkout the contributing docs as that covers linting and testing.