[gnumeric] NEWS: mention Jean's crash fix.

[Morten Welinder <mortenw src gnome org>]

commit 35b26d5b8e4f9aab880a4d6036820333dbf4e8f0
Author: Morten Welinder <terra gnome org>
Date:   Thu May 28 12:47:27 2020 -0400

    NEWS: mention Jean's crash fix.

 NEWS | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/NEWS b/NEWS
index d22dd8b28..8e3637337 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,9 @@ Andreas:
        * Improve line marker handling on import
        * Fix LaTeX export. [#489]
 
+Jean:
+       * Fix xlsx object non-import crash.
+
 Morten:
        * Fix performace issue with sample_datasource.  [#491]