Added mouse trail tracking to release notes

doc/doc/ReleaseNotes

@@ -1,7 +1,6 @@
 ------------------------  RELEASE 1.4.2  ------------------------
 
-This is a bugfix release.
-
+* Added code for mouse-trail logging.
 * The installer now uses less memory.
 * Now easier to compile with recent versions of SSL.
 * Minor bugfix in exposeJoint