Enhancement: Add MaximumCount

[localheinz]

This pull request

• adds MaximumCount as a value object

[codecov]

Codecov Report

Merging #47 (ae59d6d) into main (1df12ef) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main      #47      +/-   ##
============================================
+ Coverage     99.50%   99.51%   +0.01%     
- Complexity       50       53       +3     
============================================
  Files            13       14       +1     
  Lines           202      207       +5     
============================================
+ Hits            201      206       +5     
  Misses            1        1              

Impacted Files	Coverage Δ	Complexity Δ
src/Exception/InvalidMaximumCount.php	100.00% <100.00%> (ø)	1.00 <1.00> (?)
src/MaximumCount.php	100.00% <100.00%> (ø)	4.00 <4.00> (?)
src/Reporter/DefaultReporter.php	100.00% <100.00%> (ø)	11.00 <0.00> (-1.00)
src/Subscriber/TestPassedSubscriber.php	100.00% <0.00%> (ø)	3.00% <0.00%> (ø%)

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