Add missing strict file header

[core23]

No description provided.

[codecov]

Codecov Report

Merging #47 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #47   +/-   ##
=========================================
  Coverage     25.76%   25.76%           
  Complexity      637      637           
=========================================
  Files            53       53           
  Lines          1696     1696           
=========================================
  Hits            437      437           
  Misses         1259     1259

Impacted Files	Coverage Δ	Complexity Δ
src/Builder/AlbumTagsBuilder.php	100% <ø> (ø)	7 <0> (ø)	⬇️
src/Builder/ArtistTopTracksBuilder.php	100% <ø> (ø)	8 <0> (ø)	⬇️
src/Builder/ScrobbeBuilder.php	100% <ø> (ø)	7 <0> (ø)	⬇️
src/Builder/TrackInfoBuilder.php	100% <ø> (ø)	7 <0> (ø)	⬇️
src/Builder/AlbumTopTagsBuilder.php	100% <ø> (ø)	6 <0> (ø)	⬇️
src/Builder/TrackBuilder.php	100% <ø> (ø)	12 <0> (ø)	⬇️
src/Filter/RangeFilter.php	100% <ø> (ø)	6 <0> (ø)	⬇️
src/Builder/ArtistInfoBuilder.php	100% <ø> (ø)	8 <0> (ø)	⬇️
src/Builder/TrackTagsBuilder.php	100% <ø> (ø)	7 <0> (ø)	⬇️
src/Builder/ArtistTopAlbumsBuilder.php	100% <ø> (ø)	8 <0> (ø)	⬇️
... and 11 more

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