Update command line to package performance tool

Author: acogoluegnes

README.adoc

@@ -71,7 +71,13 @@ To build the JAR file:
 To build the https://rabbitmq.github.io/rabbitmq-stream-java-client/stable/htmlsingle/#the-performance-tool[Stream PerfTest] JAR:
 
 ----
-./mvnw clean package checksum:files -Dgpg.skip=true -Dmaven.test.skip -P performance-tool -DfinalName="stream-perf-test.jar" --no-transfer-progress
+./mvnw clean package -Dmaven.test.skip -P performance-tool
+----
+
+To run the performance tool from the created binary:
+
+----
+java -jar target/stream-perf-test.jar
 ----
 
 === Running Tests with Docker