Enhancement: Add file argument

[localheinz]

This PR

• adds a file argument

[codecov]

Codecov Report

Merging #51 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #51   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       66     67    +1     
=======================================
  Files             7      7           
  Lines           251    257    +6     
=======================================
+ Hits            251    257    +6

Impacted Files	Coverage Δ	Complexity Δ
src/Command/NormalizeCommand.php	100% <100%> (ø)	32 <0> (+1)	⬆️

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