note updated by OpenDis7Examples

examples/src/OpenDis4Examples/README.md

-# DIS Protocol Examples using Open-DIS-Java Library
+# DIS Protocol Examples using Open-DIS-4 Java Library
+
+*Note:* these examples demonstrate an earlier version of Open-DIS-Java Library.  Please work with current version [OpenDis7Examples](../OpenDis7Examples) instead.
+
+---
 
 Course examples using the [Open-DIS-Java](https://github.com/open-dis/open-dis-java) library are presented in this package.