Adjust the codecov configuration

[mwouts]

The coverage appears to have dropped dramatically, but I suspect this is just a missing coverage upload...

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: .

Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@fix_codecov

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.15%. Comparing base (d45b5a1) to head (1be7e5e).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   95.71%   96.15%   +0.44%     
==========================================
  Files          26       27       +1     
  Lines        1026     1171     +145     
==========================================
+ Hits          982     1126     +144     
- Misses         44       45       +1     

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