Screaming snake case the example environment variables

[pieterocp]

Overview

See Issue #30 for context.

Screaming snake cases the examples in the readme (as other github action environment variables do).

Checklist

[ ] If I changed code, I ran yarn build and committed resulting changes.

I only changed the readme.

[X] I added an example exercising this PRs functionality to .github/workflows/test.yml or explained why it doesn't make sense to do so.

I don't think this requires any tests, this is a documentation change really. I would also change the variable in the projects test but without changing it in the settings (which I do not have access to), this would just break the tests.

[csasarak]

Thanks for this, @pieterocp. Because of how our workflows are set up, the simplest way to get this merged is for me recreate a PR with my account in order for the required checks to run. I will make sure that you are credited as the commit author, however.

[pieterocp]

Splendid, thank you.

I will make sure that you are credited as the commit author, however.

As long as it's done, happy days.