[gnome-font-viewer] appdata: add missing developer_name tag

[Cosimo Cecchi <cosimoc src gnome org>]

commit 7ed2bbbfbe253dbf7160c265a44b7c1758363959
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu Jul 4 09:45:22 2019 -0700

    appdata: add missing developer_name tag
    
    https://gitlab.gnome.org/GNOME/gnome-font-viewer/issues/6

 data/org.gnome.font-viewer.appdata.xml.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/data/org.gnome.font-viewer.appdata.xml.in b/data/org.gnome.font-viewer.appdata.xml.in
index 8505719..6ad2994 100644
--- a/data/org.gnome.font-viewer.appdata.xml.in
+++ b/data/org.gnome.font-viewer.appdata.xml.in
@@ -18,6 +18,7 @@
       Fonts may be installed only for your use or made available to all users on the computer.
     </p>
   </description>
+  <developer_name>The GNOME Project</developer_name>
   <url type="homepage">http://www.gnome.org/gnome-3/</url>
   <url type="bugtracker">https://gitlab.gnome.org/GNOME/gnome-font-viewer/issues</url>
   <url type="donation">http://www.gnome.org/friends/</url>