fix mvn pom

Author: jeromevdl

powertools-tracing/pom.xml

@@ -88,6 +88,7 @@
             <artifactId>slf4j-simple</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
             <groupId>org.junit-pioneer</groupId>
             <artifactId>junit-pioneer</artifactId>
             <scope>test</scope>