Explicitly sort file list

[dvdoug]

Fix #803

[codecov]

Codecov Report

Merging #804 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #804      +/-   ##
============================================
+ Coverage     82.93%   82.96%   +0.02%     
+ Complexity     1112     1111       -1     
============================================
  Files            60       60              
  Lines          3411     3411              
============================================
+ Hits           2829     2830       +1     
+ Misses          582      581       -1     

Impacted Files	Coverage Δ	Complexity Δ
src/ProcessedCodeCoverageData.php	100.00% <100.00%> (ø)	51.00 <0.00> (ø)
src/CodeCoverage.php	44.68% <0.00%> (+0.18%)	96.00% <0.00%> (-1.00%)	⬆️

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