Switch to Coveralls Github action

[protoroto]

Description

Switch to Coveralls Github action

References

Fix #774

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6ae65d7) 94.38% compared to head (15b2156) 94.38%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #775   +/-   ##
========================================
  Coverage    94.38%   94.38%           
========================================
  Files           26       26           
  Lines         1871     1871           
  Branches       266      266           
========================================
  Hits          1766     1766           
  Misses          53       53           
  Partials        52       52           

Flag	Coverage Δ
unittests	94.38% <ø> (ø)

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[coveralls]

coverage: 97.167%. remained the same
when pulling 15b2156 on protoroto:feature/issue-774-switch-to-coveralls-github-action
into 6ae65d7 on nephila:develop.