update go example in readme

[jbsmith7741]

🤔 What's changed?

Update Readme for golang to the latest standard.

⚡️ What's your motivation?

After figuring out how to use the latest version of this library for go, I wanted to update the README for anyone in the future who is trying to get it to work.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct

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[kieran-ryan]

Thanks for catching @jbsmith7741! Have raised two small points of review - let me know if any queries or different perspectives on proposed changes

[kieran-ryan]

Awesome - thanks for the contribution @jbsmith7741! ✌️

[aslakhellesoy]

Hi @jbsmith7741,

Thanks for your making your first contribution to Cucumber, and welcome to the Cucumber committers team! You can now push directly to this repo and all other repos under the cucumber organization! 🍾

In return for this generous offer we hope you will:

• ✅ Continue to use branches and pull requests. When someone on the core team approves a pull request (yours or someone else's), you're welcome to merge it yourself.
• 💚 Commit to setting a good example by following and upholding our code of conduct in your interactions with other collaborators and users.
• 💬 Join the community Slack channel to meet the rest of the team and make yourself at home.
• ℹ️ Don't feel obliged to help, just do what you can if you have the time and the energy.
• 🙋 Ask if you need anything. We're looking for feedback about how to make the project more welcoming, so please tell us!

On behalf of the Cucumber core team,
Aslak Hellesøy
Creator of Cucumber