[gnumeric] xlsx: update copyright

[Morten Welinder <mortenw src gnome org>]

commit e462a49e96899d762a05b824ecd1f2c54e688c8f
Author: Morten Welinder <terra gnome org>
Date:   Sat Jan 24 10:52:28 2015 -0500

    xlsx: update copyright

 plugins/excel/xlsx-read-drawing.c  |    1 +
 plugins/excel/xlsx-write-drawing.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plugins/excel/xlsx-read-drawing.c b/plugins/excel/xlsx-read-drawing.c
index 520582b..1e066a4 100644
--- a/plugins/excel/xlsx-read-drawing.c
+++ b/plugins/excel/xlsx-read-drawing.c
@@ -4,6 +4,7 @@
  *
  * Copyright (C) 2006-2007 Jody Goldberg (jody gnome org)
  * Copyright (C) 2011 Jean Brefort (jean brefort normalesup org)
+ * Copyright (C) 2015 Morten Welinder (terra gnome org)
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
diff --git a/plugins/excel/xlsx-write-drawing.c b/plugins/excel/xlsx-write-drawing.c
index f2ec1e4..a7b8151 100644
--- a/plugins/excel/xlsx-write-drawing.c
+++ b/plugins/excel/xlsx-write-drawing.c
@@ -4,6 +4,7 @@
  *
  * Copyright (C) 2006-2007 Jody Goldberg (jody gnome org)
  * Copyright (C) 2011 Jean Brefort (jean brefort normalesup org)
+ * Copyright (C) 2015 Morten Welinder (terra gnome org)
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as