Update package.json

[nmetulev]

Summary

The latest npm package does not include the source but includes source maps. Including the source is the best way to resolve this issue. Alternatively, you can enable the inlineSources option in tsconfig.json` - let me know if this is what you prefer and I can make this change.

Motivation

The source is useful in many scenarios. For example, minification tools require the source along side source maps.

Fixes #207

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 read the CONTRIBUTING document.
• 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 added tests to cover my changes.
• All new and existing tests passed.