setted typo fix

[axiaoxin]

There’s no such word as setted, set is set, set, setting

[thinkerou]

lgtm

[codecov]

Codecov Report

Merging #2886 (db3cb47) into master (ef16867) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2886   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files          41       41           
  Lines        3062     3063    +1     
=======================================
+ Hits         3024     3025    +1     
  Misses         26       26           
  Partials       12       12           

Flag	Coverage Δ
go-1.13	98.75% <100.00%> (+<0.01%)	⬆️
go-1.14	98.59% <100.00%> (+<0.01%)	⬆️
go-1.15	98.59% <100.00%> (+0.02%)	⬆️
go-1.16	98.59% <100.00%> (+0.01%)	⬆️
go-1.17	98.49% <100.00%> (+<0.01%)	⬆️
macos-latest	98.75% <100.00%> (+<0.01%)	⬆️
nomsgpack	98.74% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	98.75% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
context.go	97.98% <ø> (ø)
binding/form_mapping.go	100.00% <100.00%> (ø)
binding/multipart_form_mapping.go	100.00% <100.00%> (ø)
gin.go	99.10% <100.00%> (+<0.01%)	⬆️

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