Fix standalone startup (hopefully)

[aslakhellesoy]

🤔 What's changed?

The standalone startup script (hopefully) works

⚡️ What's your motivation?

Fix #66

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

@darrinholst can you please confirm that 1.1.0 works and that it really fixes #66?
I wish I knew an automated way to fix this.

What I have in mind is something like cat some-rpc-file | cat node bin/cucumber-language-server.cjs --stdio and verify that we get some kind of OK response.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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