fix log string in client example

[heyitsmine]

"Request" should be "Response" here.

[codecov]

Codecov Report

Merging #3264 (b998c58) into master (0f3c94f) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3264      +/-   ##
==========================================
- Coverage   85.48%   85.47%   -0.01%     
==========================================
  Files         132      132              
  Lines        9799     9799              
==========================================
- Hits         8376     8375       -1     
  Misses       1048     1048              
- Partials      375      376       +1     

Impacted Files	Coverage Δ
packet_handler_map.go	74.60% <0.00%> (-0.40%)	⬇️

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