Fix: Actually run 'composer validate'

[localheinz]

This PR

• actually runs composer validate when the validation failed

Fixes #243.

[codecov]

Codecov Report

Merging #297 into master will increase coverage by 4.94%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #297      +/-   ##
============================================
+ Coverage     84.94%   89.89%   +4.94%     
  Complexity       37       37              
============================================
  Files             3        3              
  Lines           186      188       +2     
============================================
+ Hits            158      169      +11     
+ Misses           28       19       -9

Impacted Files	Coverage Δ	Complexity Δ
src/Command/NormalizeCommand.php	91.95% <100%> (+5.32%)	33 <1> (ø)	⬇️

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