Support to render a GitHub users to be a link

[LinuxSuRen]

close #18

[codecov-commenter]

Codecov Report

Merging #23 (02d0153) into master (31ffcfe) will increase coverage by 14.52%.
The diff coverage is 98.46%.

@@             Coverage Diff             @@
##           master      #23       +/-   ##
===========================================
+ Coverage   31.38%   45.90%   +14.52%     
===========================================
  Files           1        2        +1     
  Lines         188      220       +32     
===========================================
+ Hits           59      101       +42     
+ Misses        121      116        -5     
+ Partials        8        3        -5     

Flag	Coverage Δ
unittests	45.90% <98.46%> (+14.52%)	⬆️

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

Impacted Files	Coverage Δ
main.go	23.71% <0.00%> (-7.67%)	⬇️
function/github.go	100.00% <100.00%> (ø)

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