Add NoDiscard attributes

[Baptouuuu]

Fix #15

[codecov]

Codecov Report

❌ Patch coverage is 98.85057% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.75%. Comparing base (73da120) to head (98a3ce6).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Edge/Shape.php	91.66%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #17      +/-   ##
=============================================
+ Coverage      99.42%   99.75%   +0.33%     
  Complexity       211      211              
=============================================
  Files             22       22              
  Lines           1211     1211              
=============================================
+ Hits            1204     1208       +4     
+ Misses             7        3       -4     

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