golang: fix Subscribe bug

[guyinyou]

fix Subscribe bug
#344

[codecov-commenter]

Codecov Report

Merging #346 (b06cdd7) into master (1184903) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #346      +/-   ##
============================================
+ Coverage     34.36%   34.38%   +0.01%     
  Complexity      660      660              
============================================
  Files           220      220              
  Lines         11450    11453       +3     
  Branches        277      277              
============================================
+ Hits           3935     3938       +3     
- Misses         7261     7262       +1     
+ Partials        254      253       -1     

Flag	Coverage Δ
golang	34.12% <0.00%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
golang/simple_consumer.go	0.00% <0.00%> (ø)
golang/message_id_codec.go	61.11% <0.00%> (+5.55%)	⬆️

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