Update README.md

Author: JWeinelt

README.md

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 # ⚙️CodeLib: super advanced Bukkit and Velocity API
 
-![Version](https://img.shields.io/badge/Version-v3.3.1-green)![Update](https://img.shields.io/badge/Status-Stable-blue)[![Contribute](https://img.shields.io/badge/Contributions-Welcome-brightgreen)](CONTRIBUTING.md)
+![Version](https://img.shields.io/badge/Version-v3.3.1-green)![Update](https://img.shields.io/badge/Status-Stable-blue)[![Contribute](https://img.shields.io/badge/Contributions-Welcome-brightgreen)](CONTRIBUTING.md)[![Build](https://github.com/JWeinelt/codelib/actions/workflows/maven.yml/badge.svg)](https://github.com/JWeinelt/codelib/actions/workflows/maven.yml)
 
 Welcome to the official repository of **CodeLib!**