Fix: Avoid display of override message when updating lock file

[localheinz]

This PR

• asserts that override messages are not displayed when updating lock file
• avoids display of override messages when updating lock file

Fixes #418.

[codecov]

Codecov Report

Merging #420 into master will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #420      +/-   ##
============================================
+ Coverage     80.82%   80.92%   +0.09%     
  Complexity       41       41              
============================================
  Files             4        4              
  Lines           193      194       +1     
============================================
+ Hits            156      157       +1     
  Misses           37       37              

Impacted Files	Coverage Δ	Complexity Δ
src/Command/NormalizeCommand.php	85.54% <100.00%> (+0.08%)	34.00 <0.00> (ø)

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