feat: infer dual build type from package.json microsoft/TypeScript#54593

[knightedcodemonkey]

BREAKING CHANGE: deprecates --target-extension

• Adds --pkg-dir in place of --target-extension.
• Infers the dual build target from the package.json type field.
• Updates the README.
• Updates dependencies.

[codecov[bot]]

Codecov Report

Merging #8 (1e18ef2) into main (919e176) will decrease coverage by 0.20%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   96.67%   96.47%   -0.20%     
==========================================
  Files           3        3              
  Lines         301      284      -17     
==========================================
- Hits          291      274      -17     
  Misses         10       10              

Files Changed	Coverage Δ
src/duel.js	92.42% <100.00%> (-1.48%)	:arrow_down:
src/init.js	100.00% <100.00%> (ø)

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