Fix: Update CI badge in readme to GH Actions

[Nklya]

Fixes: #969

[coveralls]

Pull Request Test Coverage Report for Build 12587458345

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.404%

---

Totals
Change from base Build 12496983155:	0.0%
Covered Lines:	2282
Relevant Lines:	2672

---

💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.08%. Comparing base (f163044) to head (846e113).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #970   +/-   ##
=======================================
  Coverage   82.08%   82.08%           
=======================================
  Files          18       18           
  Lines        2663     2663           
=======================================
  Hits         2186     2186           
  Misses        390      390           
  Partials       87       87           

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[oliver006]

Apologies for the delay - this looks good, thanks for the PR!