Delete .coveragerc configuration file

[juhoinkinen]

This file seems to be unnecessary nowdays. Noticed while working with #587.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #588 (1e46a34) into master (3e375d4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #588   +/-   ##
=======================================
  Coverage   99.48%   99.48%           
=======================================
  Files          84       84           
  Lines        5615     5615           
=======================================
  Hits         5586     5586           
  Misses         29       29           

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