Cleaned up shutdown child handler

[sergeyklay]

No description provided.

[codecov-io]

Codecov Report

Merging #53 into master will decrease coverage by 0.56%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             master     #53      +/-   ##
===========================================
- Coverage     61.67%   61.1%   -0.57%     
- Complexity      503     506       +3     
===========================================
  Files            31      31              
  Lines          1289    1301      +12     
===========================================
  Hits            795     795              
- Misses          494     506      +12

Impacted Files	Coverage Δ	Complexity Δ
src/Workers/ForkingWorker.php	0% <0%> (ø)	89 <14> (+3)	⬆️

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