Add NoDiscard attributes

[Baptouuuu]

Fix #15

[codecov]

Codecov Report

❌ Patch coverage is 85.45455% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.51%. Comparing base (416326a) to head (e6ce9f8).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Console.php	40.00%	6 Missing ⚠️
src/Environment.php	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #17   +/-   ##
==========================================
  Coverage      91.51%   91.51%           
  Complexity       301      301           
==========================================
  Files             38       38           
  Lines           2158     2158           
==========================================
  Hits            1975     1975           
  Misses           183      183           

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