[gnome-multi-writer] trivial: Fix the AppData file

[Richard Hughes <rhughes src gnome org>]

commit c4b3c3047a0488152e6eef02c93f7769c969b6ff
Author: Richard Hughes <richard hughsie com>
Date:   Wed Feb 17 12:52:55 2016 +0000

    trivial: Fix the AppData file

 data/appdata/org.gnome.MultiWriter.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/appdata/org.gnome.MultiWriter.appdata.xml.in 
b/data/appdata/org.gnome.MultiWriter.appdata.xml.in
index 10e1264..054efbd 100644
--- a/data/appdata/org.gnome.MultiWriter.appdata.xml.in
+++ b/data/appdata/org.gnome.MultiWriter.appdata.xml.in
@@ -62,7 +62,7 @@
    Use `date -d now +%s` or `date -d 2010-01-32 +%s` to get the timestamp.
   -->
   <releases>
-    <release version="3.19.90" timestamp="2016-02-15">
+    <release version="3.19.90" date="2016-02-15">
       <description>
         <p>This unstable release fixes the following bug:</p>
         <ul>