Fix lowercase formatting in unix socket

[SerafimArts]

Fixes https://github.com/spiral/goridge-php/issues/3

[codecov]

Codecov Report

Merging #4 (9b49b3d) into master (2ddd4d0) will increase coverage by 0.98%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master       #4      +/-   ##
============================================
+ Coverage     84.03%   85.01%   +0.98%     
  Complexity      105      105              
============================================
  Files             8        8              
  Lines           263      267       +4     
============================================
+ Hits            221      227       +6     
+ Misses           42       40       -2     

Flag	Coverage Δ	Complexity Δ
php	85.01% <100.00%> (+0.98%)	0.00 <0.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
src/Relay.php	92.10% <100.00%> (+0.67%)	15.00 <0.00> (ø)
src/SocketRelay.php	83.13% <100.00%> (+0.20%)	34.00 <0.00> (ø)
src/RPC/Codec/MsgpackCodec.php	100.00% <0.00%> (+13.33%)	7.00% <0.00%> (ø%)

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