Fix: Revert deprecation of file argument

[localheinz]

This PR

• reverts the deprecation of the file argument as it turns out that the same functionality cannot be achieved using the --working-dir option

Follows #143.
Fixes #165.

[codecov]

Codecov Report

Merging #166 into 1.x will decrease coverage by 0.09%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##                1.x     #166     +/-   ##
===========================================
- Coverage     82.77%   82.68%   -0.1%     
  Complexity       36       36             
===========================================
  Files             2        2             
  Lines           180      179      -1     
===========================================
- Hits            149      148      -1     
  Misses           31       31

Impacted Files	Coverage Δ	Complexity Δ
src/Command/NormalizeCommand.php	87.05% <100%> (-0.08%)	33 <0> (ø)

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