Move from Travis to github workflow, disable coveralls

[yarikoptic]

workflow is based on dandi-cli one

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0345105) 83.29% compared to head (e7cd732) 81.25%.
Report is 8 commits behind head on master.

❗ Current head e7cd732 differs from pull request most recent head d2ee0ce. Consider uploading reports for the commit d2ee0ce to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   83.29%   81.25%   -2.05%     
==========================================
  Files          47       46       -1     
  Lines        2437     2432       -5     
  Branches      259      259              
==========================================
- Hits         2030     1976      -54     
- Misses        332      379      +47     
- Partials       75       77       +2     

Flag	Coverage Δ
unittests	81.25% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
duecredit/collector.py	71.75% <ø> (ø)

... and 5 files with indirect coverage changes

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[a-detiste]

To further improve this package I would test it with mypy (I can add annotations in an other PR)

[yarikoptic]

To further improve this package I would test it with mypy (I can add annotations in an other PR)

I do not think we have any type annotation ATM here. Contributions are of cause welcome and thanks in advance!