Add unit tests for the GitHub API requesting with token

[LinuxSuRen]

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[codecov-commenter]

Codecov Report

Merging #27 (c627afa) into master (a24b90d) will increase coverage by 3.53%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   88.49%   92.03%   +3.53%     
==========================================
  Files           2        2              
  Lines         252      251       -1     
==========================================
+ Hits          223      231       +8     
+ Misses         19       14       -5     
+ Partials       10        6       -4     

Flag	Coverage Δ
unittests	92.03% <100.00%> (+3.53%)	⬆️

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Impacted Files	Coverage Δ
function/github.go	100.00% <100.00%> (+5.79%)	⬆️
main.go	89.07% <0.00%> (+2.73%)	⬆️

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