fix reference

Author: krusche

README.adoc

@@ -13,7 +13,7 @@
 The Artemis Java Test Sandbox
 
 image:https://github.com/ls1intum/Ares/workflows/Java%20CI/badge.svg?branch=main[Java CI]
-https://maven-badges.herokuapp.com/maven-central/de.tum.in.ase/artemis-java-test-sandbox[image:https://img.shields.io/maven-central/v/de.tum.in.ase/ls1intum_Ares[Maven Central]]
+https://maven-badges.herokuapp.com/maven-central/de.tum.in.ase/artemis-java-test-sandbox[image:https://img.shields.io/maven-central/v/de.tum.in.ase/artemis-java-test-sandbox[Maven Central]]
 image:https://img.shields.io/nexus/s/de.tum.in.ase/artemis-java-test-sandbox?label=latest%20snapshot&server=https%3A%2F%2Foss.sonatype.org[Sonatype Nexus (Snapshots)]
 
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