Add NoDiscard attributes

[Baptouuuu]

Fix #13

[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.36%. Comparing base (386f080) to head (6476200).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Document.php	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #15   +/-   ##
==========================================
  Coverage      98.36%   98.36%           
  Complexity       131      131           
==========================================
  Files             27       27           
  Lines            858      858           
==========================================
  Hits             844      844           
  Misses            14       14           

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