Enhancement: Add --diff option

[localheinz]

This PR

• adds a --diff option

[codecov]

Codecov Report

Merging #303 into master will increase coverage by 0.4%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master     #303     +/-   ##
===========================================
+ Coverage     87.02%   87.43%   +0.4%     
- Complexity       36       38      +2     
===========================================
  Files             4        4             
  Lines           185      191      +6     
===========================================
+ Hits            161      167      +6     
  Misses           24       24

Impacted Files	Coverage Δ	Complexity Δ
src/Command/NormalizeCommand.php	91.86% <100%> (+0.29%)	33 <0> (+2)	⬆️

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