Add Open Source Games (#2171)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

@@ -587,7 +587,7 @@
 - [Game Development](https://github.com/ellisonleao/magictools#readme)
 - [Game Talks](https://github.com/hzoo/awesome-gametalks#readme)
 - [Godot](https://github.com/godotengine/awesome-godot#readme) - Game engine.
-- [Open Source Games](https://github.com/leereilly/games#readme)
+- [Open Source Games](https://github.com/michelpereira/awesome-open-source-games#readme)
 - [Unity](https://github.com/RyanNielson/awesome-unity#readme) - Game engine.
 - [Chess](https://github.com/hkirat/awesome-chess#readme)
 - [LÖVE](https://github.com/love2d-community/awesome-love2d#readme) - Game engine.