updated links

README.md

 This project contains original assets, presentations and source code for MV3500 Networked Graphics course.
 
 Key course sites:
-* [MV3500 Course Syllabus](https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/blob/master/MV3500NetworkedGraphicsSyllabus2018JulySeptember.pdf)
+* [MV3500 Course Syllabus](https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/blob/master/MV3500NetworkedGraphicsSyllabus2019JulySeptember.pdf)
 * [NPS CLE Sakai site](https://cle.nps.edu) for MV3500 course
 * [NPS GitLab site: NetworkedGraphicsMV3500](https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500)
 
 References and Resources:
 * [GitLab Flavored Markdown (GFM)](https://docs.gitlab.com/ee/user/markdown.html)
 * [Java Archive (.jar)](https://docs.oracle.com/javase/tutorial/deployment/jar/basicsindex.html) for sharable/runnable software libraries
-* [Java SE JDK 8 download](http://www.oracle.com/technetwork/java/javase/downloads/index.html) (not JDK 9 or 10)
-* [Netbeans 8.2](http://www.netbeans.org) and [Using Git Support in NetBeans IDE](https://netbeans.org/kb/docs/ide/git.html) 
-and [Video of Cloning a Git Repository Using NetBeans IDE](https://netbeans.org/kb/docs/ide/git_nb_ssh_screencast.html)
+* [Java SE JDK download](http://www.oracle.com/technetwork/java/javase/downloads/index.html) (JDK 8 or 12)
+* [Netbeans](http://www.netbeans.org) (version 8.2 or 11), [Using Git Support in NetBeans IDE](https://netbeans.org/kb/docs/ide/git.html) 
+and [Video of Cloning a Git Repository Using NetBeans IDE](https://netbeans.org/kb/docs/ide/git_nb_ssh_screencast.html), or
 * [Open-DIS Repository](https://github.com/open-dis) and [Distributed Interactive Simulation: The Missing Handbook](https://github.com/open-dis/DISTutorial/blob/master/README.md)
 * [Savage Developers Guide](https://savage.nps.edu/Savage/developers.html) resources for [Cygwin](https://savage.nps.edu/Savage/developers.html#Cygwin), [DIS](https://savage.nps.edu/Savage/developers.html#DIS) and [telnet](https://savage.nps.edu/Savage/developers.html#telnet)
 * [Sequence Diagram](https://en.wikipedia.org/wiki/Sequence_diagram) and [Timing Diagram (UML)](https://en.wikipedia.org/wiki/Timing_diagram_(Unified_Modeling_Language)) on Wikipedia