Fix: Drop support for PHP 7.2

[localheinz]

This pull request

• drops support for PHP 7.2

Fixes #837.

[codecov]

Codecov Report

Merging #845 (f6053e1) into main (ff00fd4) will decrease coverage by 0.22%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #845      +/-   ##
============================================
- Coverage     84.04%   83.81%   -0.23%     
  Complexity       59       59              
============================================
  Files             4        4              
  Lines           282      278       -4     
============================================
- Hits            237      233       -4     
  Misses           45       45              

Impacted Files	Coverage Δ
src/Command/NormalizeCommand.php	90.32% <0.00%> (-0.16%)	⬇️

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