Add NoDiscard attributes

[Baptouuuu]

Fix #3

[codecov]

Codecov Report

❌ Patch coverage is 97.61905% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.24%. Comparing base (b04b9a6) to head (2d51cc2).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Template.php	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop       #9   +/-   ##
==========================================
  Coverage      99.24%   99.24%           
  Complexity       455      455           
==========================================
  Files             52       52           
  Lines           3691     3691           
==========================================
  Hits            3663     3663           
  Misses            28       28           

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