Stray fixes in Java and JS

[davidjgoss]

🤔 What's changed?

A few stray fixes for things I didn't catch in #62

• countTestCasesStarted now accounts for retries (by way of calling findAllTestCaseStarted internally)
• findPickleStepBy now calls requireNonNull on the right argument
• Update the support matrix in the README
• Export Lineage and related symbols in JS on entry point

🏷️ What kind of change is this?

• 📖 Documentation (improvements without changing code)
• 🐛 Bug fix (non-breaking change which fixes a defect)

📋 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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