Delete version from User-Agent

[rinchsan]

No description provided.

[codecov]

Codecov Report

Merging #3 (e2427f4) into master (acedbe3) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   90.78%   90.71%   -0.07%     
==========================================
  Files           9        9              
  Lines         141      140       -1     
==========================================
- Hits          128      127       -1     
  Misses          8        8              
  Partials        5        5              

Impacted Files	Coverage Δ
api.go	100.00% <100.00%> (ø)

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