Enhancement: Handle oneOf

[localheinz]

This PR

• handles oneOf

[codecov]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #45   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity      100    104    +4     
=======================================
  Files            13     13           
  Lines           279    290   +11     
=======================================
+ Hits            279    290   +11

Impacted Files	Coverage Δ	Complexity Δ
src/SchemaNormalizer.php	100% <100%> (ø)	38 <7> (+4)	⬆️

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