Switch to Coveralls Github action

[protoroto]

Description

Switch to Coveralls Github action

References

Fix #155

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: 97.921%. remained the same
when pulling 10517e0 on feature/issue-155-switch-to-coveralls-github-action
into b546c6b on master.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a83ef72) 96.49% compared to head (10517e0) 96.49%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #156   +/-   ##
=======================================
  Coverage   96.49%   96.49%           
=======================================
  Files           8        8           
  Lines         914      914           
  Branches       69       69           
=======================================
  Hits          882      882           
  Misses         19       19           
  Partials       13       13           

Flag	Coverage Δ
unittests	96.49% <ø> (ø)

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