fix: detect yarn.lock files in bin command

[candrews]

• [ ] Tests written and linted
• [ ] Documentation written / README.md updated https://snyk.io/docs/snyk-for-node/
• [x] Follows CONTRIBUTING agreement
• [x] Commit history is tidy https://git-scm.com/book/en/v2/Git-Branching-Rebasing
• [ ] Reviewed by Snyk team

What this does

In the bin command, detect yarn.lock files in addition to the existing support for package.json and package-lock.json.

Notes for the reviewer

node bin/index.js from a directory containing a yarn.lock file now display results.

More information

Screenshots

Visuals that may help the reviewer

[CLAassistant]

All committers have signed the CLA.

[JamesPatrickGill]

Hi @candrews, thanks for this PR! I'll be looking after this PR and helping you get it released.

Firstly due to our internal systems requiring a non fork branch to run CI could you please first point this PR at this branch detect-yarn-lock-in-bin-cmd. This will allow me to run tests before deploying it and hence merge your PR safely.

In the meantime I will look over the PR.

Thanks again 😃

[github-actions[bot]]

Your PR has not had any activity for 60 days. In 7 days I'll close it. Make some activity to remove this.

[github-actions[bot]]

Your PR has now been stale for 7 days. I'm closing it.