Allow className to be passed to Spinner

[ghrlee]

Author Checklist

• [x] Add unit test(s)
• [x] Update version in package.json (see the versioning guidelines)
• [ ] Update documentation (if necessary)
• [ ] Add story to storybook (if necessary)
• [x] Assign dev reviewer

[chawes13]

@ghrlee Looks good! Can you update the version in package.json as a patch update? Check out https://semver.org/ for more details on semantic versioning if that's new to you!

[ghrlee]

@ghrlee Looks good! Can you update the version in package.json as a patch update? Check out https://semver.org/ for more details on semantic versioning if that's new to you!

no problem, is there anywhere else that should be updated or just the package.json file?