Update default globs to work with Pytest-BDD conventions

[aslakhellesoy]

🤔 What's changed?

The globs for finding step definitions

⚡️ What's your motivation?

Work out of the box with pytest-bdd conventions. See cucumber/language-service#84 (comment)

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

📋 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.