replace tests badge with circleci

README.md

@@ -15,7 +15,7 @@ exo: Run your own AI cluster at home with everyday devices. Maintained by [exo l
 </h3>
 
 [![GitHub Repo stars](https://img.shields.io/github/stars/exo-explore/exo)](https://github.com/exo-explore/exo/stargazers)
-[![Tests](https://github.com/exo-explore/exo/actions/workflows/test.yml/badge.svg)](https://github.com/exo-explore/exo/actions/workflows/test.yml)
+[![Tests](https://circleci.com/gh/exo-explore/exo.svg?style=svg)](https://circleci.com/gh/exo-explore/exo)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 
 </div>