feat: take stdin input

[lili2311]

• [ ] Tests written and linted ℹ︎
• [ ] Documentation written in Wiki/README
• [ ] Commit history is tidy & follows Contributing guidelines ℹ︎

What this does

Take stdin input and run the conversion. Print it to stdout when done

[aarlaud]

:tada: This PR is included in version 1.4.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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