Update README.md use node 20

[jbampton]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request updates the project's README.md to reflect a change in the recommended Node.js version for contributors. The documentation now advises using Node.js 20.x or higher, ensuring that development environments align with more current and supported versions of the runtime.

Highlights

• Node.js Version Update: The README.md file has been updated to recommend Node.js version 20.x or higher, replacing the previous recommendation of 18.x or higher.

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[gemini-code-assist]

Code Review

This pull request updates the required Node.js version in the README file to 20.x. While this documentation change is good, the project would benefit from programmatically enforcing this version requirement. I've added a suggestion to specify the Node.js version in package.json using the engines field to ensure a consistent development environment for all contributors.