fix: code links in README point to a .ts file

[shazron]

closes #65

How Has This Been Tested?

1. rm -rf node_modules
2. npm i
3. npm test
4. npm run prepack
5. Inspect README.md for See code: links (should point to the .js file)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (68f4ec7) 100.00% compared to head (698f15c) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #66   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          508       508           
  Branches        92        92           
=========================================
  Hits           508       508           

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