Update README.md

Author: lukasmatusiewicz

README.md

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-![Java Code Coverage](https://github.com/privacyidea/java-client/.github/workflows/maven.yml/jacoco.svg?event=push)
+![Java Code Coverage](https://github.com/privacyidea/java-client/.github/workflows/maven.yml/jacoco.svg)
 
 # Java client for privacyIDEA
 Java client to aid develop plugins for the privacyIDEA authentication server.