Fix: Rename parameter and field

[localheinz]

This PR

• renames a parameter and a field

Follows #23.

[codecov]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #26   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       37     37           
=======================================
  Files             8      8           
  Lines           106    106           
=======================================
  Hits            106    106

Impacted Files	Coverage Δ	Complexity Δ
src/License/Header.php	100% <100%> (ø)	4 <2> (ø)	⬇️

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