modified groupId to match other public dfki artifacts
modified groupId to match other public dfki artifacts

dyanarose/jsonld-java,westei/jsonld-java,jsonld-java/jsonld-java,westei/jsonld-java,tristan/jsonld-java,giorgos1987/jsonld-java,tristan/jsonld-java,giorgos1987/jsonld-java,dyanarose/jsonld-java