docs(contributing): fix broken link (#911)

Co-authored-by: neriyarden <[email protected]>

Author: neriyarden

Diff for: CONTRIBUTING.md

@@ -3,7 +3,7 @@
 Thanks for being willing to contribute!
 
 Working on your first Pull Request? You can learn how from this free series
-[How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github).
+[How to Contribute to an Open Source Project on GitHub](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github).
 
 Tweaking ESLint rules is mostly about traversing through the AST. [AST Explorer](https://astexplorer.net) is a great tool that simplifies the process.