Use shelljs version 0.8.4

[dylanjustice]

Resolves #145

• Related GitHub issue(s) linked in PR description
• Destination branch merged, built and tested with your changes
• Code formatted and follows best practices and patterns
• Code builds cleanly (no additional warnings or errors)
• Manually tested
• Automated tests are passing
• No decreases in automated test coverage
• [/] Documentation updated (readme, docs, comments, etc.)
• Localization: No hard-coded error messages in code files (minimally in string constants)

[codecov]

Codecov Report

Merging #146 (10f7997) into main (dbfd744) will increase coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
+ Coverage   77.50%   77.75%   +0.24%     
==========================================
  Files          28       28              
  Lines        1218     1218              
  Branches      182      182              
==========================================
+ Hits          944      947       +3     
+ Misses        239      236       -3     
  Partials       35       35              

Impacted Files	Coverage Δ
modules/github.js	68.83% <0.00%> (+0.93%)	⬆️
modules/js.js	96.29% <0.00%> (+3.70%)	⬆️

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