Write errors to the error output

[villfa]

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[codecov]

Codecov Report

Merging #313 (5389229) into master (ed3493a) will decrease coverage by 0.12%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #313      +/-   ##
============================================
- Coverage     99.23%   99.11%   -0.13%     
  Complexity        2        2              
============================================
  Files            40       40              
  Lines           789      795       +6     
============================================
+ Hits            783      788       +5     
- Misses            6        7       +1     

Impacted Files	Coverage Δ
src/Command/RunCommand.php	98.85% <66.66%> (-1.15%)	⬇️
src/Command/Helper/MaxScoreChecker.php	100.00% <100.00%> (ø)

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