Enhancement: Implement Specification::always()

[localheinz]

This pull request

• implements Specification::always()

[codecov]

Codecov Report

Merging #58 (6f92452) into main (4717354) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 6f92452 differs from pull request most recent head 6652d9b. Consider uploading reports for the commit 6652d9b to get more accurate results

@@             Coverage Diff             @@
##                main       #58   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        38        39    +1     
===========================================
  Files              5         5           
  Lines            104       107    +3     
===========================================
+ Hits             104       107    +3     

Impacted Files	Coverage Δ
src/Specification.php	100.00% <100.00%> (ø)

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