[BACKLOG-35398] Update README JDK to 11

Author: urena-kenny

README.md

@@ -36,7 +36,7 @@ Pentaho platform uses the maven framework.
 
 #### Pre-requisites for building the project:
 * Maven, version 3+
-* Java JDK 1.8
+* Java JDK 11
 * This [settings.xml](https://raw.githubusercontent.com/pentaho/maven-parent-poms/master/maven-support-files/settings.xml) in your <user-home>/.m2 directory
 
 #### Building it