Fix README.md typo - Githubissues

PRs don't have access to secrets so you will need to provide a link to a successful run of the workflows from your own repo.

[x] Read the contribution guide and accept the code of conduct
[ ] Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR in the documentation repo)
[ ] Readme (updated or not needed)
[ ] Tests (added, updated or not needed)

game-ci / unity-test-runner