Add GitHub Sponsors to Readme

Version updated for JamesIves/github-sponsors-readme-action to version v1.3.1.

  • This action is used across all versions by 1,466 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

What’s Changed

  • Made a change that assumes tier is optional to prevent a NPE for some users.

Full Changelog: https://github.com/JamesIves/github-sponsors-readme-action/compare/v1.3.0...v1.3.1