📝 Adds a warning emoji

This is mostly so I catch it because I see to share the wrong one.

README.md

@@ -5,7 +5,7 @@ Here is a list of Python Conferences around the world. The goal is to make it ea
 - If you would like to add a conference or tool, please [submit a pull request](https://github.com/python-organizers/conferences/pulls).
 - If you are a conference organizer, we can give you direct access to the repository, but it is your responsibility to update your own event! [Open an issue](https://github.com/python-organizers/conferences/issues/new?template=request-for-access-as-a-conference-organizer.md) to add yourself to the repository.
 
-This repository does not power www.pycon.org; to add an event to www.pycon.org, see [its official repository](https://github.com/PyCon/pycon.org#adding-your-pycon-to-the-website). See also https://github.com/python-organizers/resources.
+:warning: This repository does not power www.pycon.org; to add an event to www.pycon.org, see [its official repository](https://github.com/PyCon/pycon.org#adding-your-pycon-to-the-website). See also https://github.com/python-organizers/resources.
 
 ## File Format