Update readme.md

sindresorhus · web-flow · commit b1d8b9fc0d5a · 2021-09-05T11:19:21.000+02:00
diff --git a/readme.md b/readme.md
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 > The minimal amount of CSS to replicate the GitHub Markdown style
 
+**The CSS is generated. Contributions should go to [this repo](https://github.com/sindresorhus/generate-github-markdown-css).**
+
 [<img src="https://cloud.githubusercontent.com/assets/170270/5219062/f22a978c-7685-11e4-8316-af25b6c89bc0.png" width="300">](http://sindresorhus.com/github-markdown-css)
 
 ## [Demo](https://sindresorhus.com/github-markdown-css)
