Fixed twine upload destination for TestPyPI

[Magnus167]

twine upload dist/* --> twine upload -r testpypi dist/*

[codecov-commenter]

Codecov Report

Base: 60.62% // Head: 60.62% // No change to project coverage 👍

Coverage data is based on head (647173a) compared to base (ef8128d).
Patch has no changes to coverable lines.

❗ Current head 647173a differs from pull request most recent head e8ad0ed. Consider uploading reports for the commit e8ad0ed to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #573   +/-   ##
========================================
  Coverage    60.62%   60.62%           
========================================
  Files           26       26           
  Lines         2809     2809           
========================================
  Hits          1703     1703           
  Misses        1106     1106           

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