Update README.md

Author: zeibura

README.md

@@ -42,7 +42,7 @@ With the Code4z extension pack you can:
 
 ## Prerequisites
 
-* Java installed on your machine.
+* Java JRE version 11 or higher with the PATH variable correctly configured.
 * Individual extension prerequisites are detailed in the individual readme files linked below.
 
 ## [COBOL Language Support](https://marketplace.visualstudio.com/items?itemName=broadcomMFD.cobol-language-support)