[gnumeric] NEWS: mention xlsx work.

[Morten Welinder <mortenw src gnome org>]

commit dcf35ac9fd342a4698236cc708847731f624b417
Author: Morten Welinder <terra gnome org>
Date:   Mon Oct 23 09:47:08 2017 -0400

    NEWS: mention xlsx work.

 NEWS |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 5d66062..d6063d4 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,7 @@ Morten:
        * Avoid to-pixdata options for resources.  It's going away.
        * Minor CORREL improvement.
        * Fix error on xlsx files with bogus Print_Area.
+       * xlsx import improvements for contour graphs.
 
 --------------------------------------------------------------------------
 Gnumeric 1.12.35