update release notes to tell about faceted track selector, vertical s…

…croll bar, and the loading of additional feature data

release-notes.txt

@@ -1,5 +1,19 @@
 {{$NEXT}}
 
+ * Added a full-featured faceted track selector for users that have
+   many (hundreds or thousands) of tracks.  This can be turned on by
+   setting the `trackSelectorType` config variable to "Faceted".  See
+   the JBrowse wiki for more documentation on how to use faceted track
+   selection.
+
+ * Added a vertical-scrolling marker on the right side of the track
+   pane, making it much easier to discern the vertical position of the
+   track display.
+
+ * biodb-to-json.pl and flatfile-to-json.pl now load all available
+   feature data: all attributes of features are now encoded in the
+   JSON and are available for use by feature callbacks.
+
 1.3.1     2012-04-19 17:55:44 America/New_York
 
  * Fixed memory-management bug that caused way too much RAM to be used