docs: Add link to GitHub Actions Hackathon

https://github.blog/2020-02-27-were-challenging-you-to-create-your-very-own-github-actions/
peaceiris · Mar 7, 2020 · 97b68d8 · 97b68d8
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 Label triggered GitHub Actions for commenting on issues or pull requests, then close or reopen those.
 
+This Action was submitted to the [GitHub Actions Hackathon](https://github.blog/2020-02-27-were-challenging-you-to-create-your-very-own-github-actions/).
+
 
 
 ## Getting Started