Update README.md

Author: Oliver Weiler

README.md

@@ -23,6 +23,10 @@ will not mess up ZIP Forge's indentation.
 
 ZIP Forge is based on Java's [ZIP File System Provider](https://docs.oracle.com/javase/8/docs/technotes/guides/io/fsp/zipfilesystemprovider.html) and requires no external dependencies.
 
+## :jigsaw: Modular
+
+ZIP Forge is published as a Java 9 module while still compatible with Java 8.
+
 # :hammer_and_wrench: Installation
 
 ## Maven