Adding custom header

[jayhuang75]

Adding the custom header in Param

[codecov-io]

Codecov Report

Merging #30 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   94.45%   94.45%           
=======================================
  Files           4        4           
  Lines         361      361           
=======================================
  Hits          341      341           
  Misses         15       15           
  Partials        5        5

Impacted Files	Coverage Δ
operation.go	100% <100%> (ø)	⬆️

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[easonlin404]

@jayhuang75 Can you provide an example or document to demonstrate this PR?

[jayhuang75]

@easonlin404 Yes, definitely, here is the example
// @Param Authorization header string true "With the bearer started"

[easonlin404]

LGTM

[easonlin404]

@jayhuang75 please use the email address used for the commits is associated with your GitHub account next time. 😄
https://help.github.com/articles/why-are-my-contributions-not-showing-up-on-my-profile/