Fix: Use real path to schema.json

[localheinz]

This PR

• uses the real path to schema.json

[codecov]

Codecov Report

Merging #364 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #364   +/-   ##
=========================================
  Coverage     87.43%   87.43%           
  Complexity       38       38           
=========================================
  Files             4        4           
  Lines           191      191           
=========================================
  Hits            167      167           
  Misses           24       24

Impacted Files	Coverage Δ	Complexity Δ
src/NormalizePlugin.php	75% <100%> (ø)	3 <0> (ø)	⬇️

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