fix: ACNA-2807 - code links in README point to a .ts file

[shazron]

closes #332

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

• [X] 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:

• [X] 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.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (573379e) 100.00% compared to head (fbc76aa) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #333 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 66 66 Lines 1745 1745 Branches 369 369 ========================================= Hits 1745 1745 ```

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