Fix: README.md

[localheinz]

This PR

• updates README.md after the merge of ergebnis/composer-json-normalizer

[codecov]

Codecov Report

Merging #632 (a30a090) into main (a5a8ecb) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #632   +/-   ##
=========================================
  Coverage     86.60%   86.60%           
  Complexity       56       56           
=========================================
  Files             4        4           
  Lines           224      224           
=========================================
  Hits            194      194           
  Misses           30       30           

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