feat: make --checkCI optionable for git-node-land

[joyeecheung]

Fixes: #527

[codecov]

Codecov Report

Merging #528 (853b364) into master (9006b30) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
+ Coverage   82.49%   82.51%   +0.02%     
==========================================
  Files          35       35              
  Lines        1742     1744       +2     
==========================================
+ Hits         1437     1439       +2     
  Misses        305      305              

Impacted Files	Coverage Δ
lib/pr_checker.js	97.16% <100.00%> (+0.02%)	⬆️

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