Update README.md

IEEE missing last "E"

README.md

 # open-dis7-java
-Type-safe java implementation of the DIS Protocol v. 7, IEE 1278.1-2012
+Type-safe java implementation of the DIS Protocol v. 7, IEEE 1278.1-2012
 
 **IMPORTANT!**  This project is not complete and is in a testing phase.  Until this notice is removed, use the DIS libraries under the **open-dis-java** and **Enumerations** projects.