feat: cwd maybe not baseDir

[zhennann]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

[codecov-io]

Codecov Report

Merging #15 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #15   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files           6        6           
  Lines         165      165           
=======================================
  Hits          163      163           
  Misses          2        2

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

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[popomore]

• egg-scripts@2.2.0