[LyX/master] Update RELEASE-NOTES

[Juergen Spitzmueller]

commit 0e6a7aa85a4fa4375da09ca493fc1b532835a83f
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Tue Dec 31 12:24:25 2019 +0100

    Update RELEASE-NOTES
---
 lib/RELEASE-NOTES |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index f7f889d..262edd9 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -32,6 +32,8 @@
 
 !!!The following pref variables were added in 2.4:
 
+* \ct_additions_underlined true|false: determines whether additions in change tracking
+  are underlined in the workarea (default: true).
 
 
 !!!The following pref variables were changed in 2.4:
@@ -57,14 +59,19 @@
 
 !!!The following new LyX functions have been introduced in 2.4:
 
-* paragraph-select is a new convenience function to select the paragraph
-  surrounding the actual cursor position.
+* bidi is a helper function to implement icons that are different between LTR and RTL text. 
+
+* buffer-reset-export advises LyX to remove the auxiliary files before doing the next
+  export.
 
 * buffer-write-as-template is a new convenience function to ease saving a document
   in the (personal) templates folder.
 
 * export-cancel: Used to cancel background export processes.
 
+* paragraph-select is a new convenience function to select the paragraph
+  surrounding the actual cursor position.
+
 * tabular-style-insert: Insert a table in a specified style.