chore: add description for ignore-stderr

[atian25]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov-io]

Codecov Report

Merging #18 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage    98.8%   98.81%   +0.01%     
==========================================
  Files           6        6              
  Lines         167      169       +2     
==========================================
+ Hits          165      167       +2     
  Misses          2        2

Impacted Files	Coverage Δ
lib/cmd/start.js	100% <100%> (ø)	⬆️

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