add details of maven test run workaround

Author: ibalosh

pom.xml

@@ -171,6 +171,7 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.19.1</version>
+                <!-- workaround line to make test work on java10 https://maven.apache.org/surefire/maven-surefire-plugin/examples/class-loading.html -->
                 <configuration>
                     <useSystemClassLoader>false</useSystemClassLoader>
                 </configuration>