check if there is only single default case in match

[mtk3d]

Fixes #61

[codecov]

Codecov Report

Merging #62 (660afdf) into master (a59a3e1) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #62      +/-   ##
============================================
+ Coverage     94.30%   94.34%   +0.03%     
- Complexity      463      465       +2     
============================================
  Files            48       48              
  Lines           984      990       +6     
============================================
+ Hits            928      934       +6     
  Misses           56       56              

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

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[akondas]

Thanks 🍻

[mtk3d]

🍻 😄