Update readme

scripts/readme.txt

@@ -1,22 +1,14 @@
 =======================
-IGV BINARY DISTRIBUTION
+IGV DISTRIBUTION
 =======================
 
 Prerequisites:
 
-Java 11 (http://openjdk.java.net).  Not compatible with Java 8, 9, 10.  We do not test 
-on Java releases > 11 and cannot vouch for the behavior.
+Java 17 or greater is required.  A free open source distributions of Java is available at https://adoptium.net/.
 
-Java 11 is bundled with our "Java included" distributions.
-
-For our other "separate Java 11 required" distributions, Java 11 must be installed and made
-available as the default.  These bundles are recommended only for those users that wish to 
-manage Java for themselves.
-
-Note that we provide both a Mac App and a Windows installer for users on those platforms that
-want a more standard way to launch.
 
 Instructions:
+-------------
 
 1. Download and unzip the distribution file to a directory of your choice.
 
@@ -31,6 +23,10 @@ igv.command       (for macOS, double-click to start)
 Some of these may not be present depending on the distribution you downloaded.  You might have to
 make the script executable (e.g. chmod a+x igv.sh) depending on the way the bundle was unpacked.
 
+
+Advanced options follow -- these are not common:
+------------------------------------------------
+
 The bat and shell scripts are configured to start IGV with 4GB of memory.  This is a 
 reasonable default for most machines but if you are working with very large datasets
 you can override this setting (and other Java-related defaults) by editing IGV's