Switch to Coveralls Github action

[protoroto]

Description

Switch to Coveralls Github action

References

Fix #104

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[coveralls]

coverage: 100.0%. remained the same
when pulling 1364422 on feature/issue-104-switch-to-coveralls-github-action
into e8040f6 on develop.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e8040f6) 100.00% compared to head (1364422) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #105   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          152       152           
  Branches        19        19           
=========================================
  Hits           152       152           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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