Update README.md

Author: leaddevops

jenkins/Install/README.md

@@ -16,7 +16,7 @@ sudo bash /tmp/installJenkins.sh
 ```
 sudo add-apt-repository ppa:openjdk-r/ppa
 sudo apt-get update
-sudo apt-get install -y openjdk-8-jdk
+sudo apt-get install -y openjdk-11-jdk
 ```
 ### Install Maven  ( on Jenkins machine )
 ```