Fix: License year

[localheinz]

This pull request

• fixes the license year
• runs make coding-standards

[codecov]

Codecov Report

Merging #20 (ac6f772) into main (3418d3e) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main       #20   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        33        33           
===========================================
  Files              5         5           
  Lines            109       109           
===========================================
  Hits             109       109           

Impacted Files	Coverage Δ
src/Exception/InvalidJsonPointer.php	100.00% <ø> (ø)
src/Exception/InvalidReferenceToken.php	100.00% <ø> (ø)
src/JsonPointer.php	100.00% <ø> (ø)
src/JsonPointers.php	100.00% <ø> (ø)
src/ReferenceToken.php	100.00% <ø> (ø)

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