Fix non-dirty, non-empty slug value being incorrectly regenerated on update.

[ADmad]

…update.

[codecov]

Codecov Report

Merging #46 (6e91b4d) into master (dba1c1d) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 6e91b4d differs from pull request most recent head 1eb054f. Consider uploading reports for the commit 1eb054f to get more accurate results

@@             Coverage Diff              @@
##             master      #46      +/-   ##
============================================
- Coverage     97.90%   97.87%   -0.03%     
+ Complexity       61       60       -1     
============================================
  Files             3        3              
  Lines           143      141       -2     
============================================
- Hits            140      138       -2     
  Misses            3        3              

Impacted Files	Coverage Δ
src/Model/Behavior/SlugBehavior.php	97.60% <100.00%> (-0.04%)	⬇️

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