Switch to Coveralls Github action

[protoroto]

Description

Switch to Coveralls Github action

References

Fix #65

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 (160ed62) 100.00% compared to head (2c0aa09) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop       #66   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          156       156           
  Branches        26        26           
=========================================
  Hits           156       156           

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

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[coveralls]

coverage: 100.0%. remained the same
when pulling 2c0aa09 on protoroto:feature/issue-65-switch-to-coveralls-github-action
into 160ed62 on nephila:develop.