Bump acorn from 6.1.1 to 6.4.1 in /books

dependabot[bot]

2020-04-04 d76796e2c1baa698ef40f9ccd764b9878ff3d9e0

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#!/bin/sh
 
echo "Starting hello-java app..."
echo "JVM options => $JAVA_OPTIONS"
echo
 
java $JAVA_OPTIONS -jar /opt/app-root/bin/hello-java.jar