Add in documentation for version 3.3.0. Changing log4j to version

2.13.2.

RELEASE_NOTES.txt

+Release 3.3.0 (05/04/2020)
+- Change log4j version from 1.2.7 to 2.13.2.  Code changes to adapt were
+   necessary.  Changed config file from log4j.properties to log4j2.xml
+- change jar file for postgresql from 9.3-1102.jdbc41 to 42.2.8.  The underlying 
+    postgresql in support changed from 9.3 to 9.6 a while ago.
+
 Release 3.2.2 (02/24/2020)
 =============================
 - Added user documentation (Getting Started guide)