Rework async strategy

[Baptouuuu]

Fix #12

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.20%. Comparing base (dd63aa8) to head (24edcaf).

Files with missing lines	Patch %	Lines
src/Handler/Async.php	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #14      +/-   ##
============================================
- Coverage     89.52%   89.20%   -0.33%     
- Complexity      128      132       +4     
============================================
  Files            18       18              
  Lines           420      426       +6     
============================================
+ Hits            376      380       +4     
- Misses           44       46       +2     

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