[evince] metadata: Make metadata dual licensed

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 67a541a4474cd2c3b7ce2dbc43c44d783f5da1f0
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Mon Jul 30 17:10:48 2018 -0400

    metadata: Make metadata dual licensed
    
    * Add GDFL-1.3-only to the existing GPL-2.0+ to the metadata.
    
    Approved by the contributors who have written the metadata:
      * Christian Persch
      * Richard Hughes
      * Carlos García Campos
    
    See issue #775 for their approval.
    
    Fixes #775

 org.gnome.Evince.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/org.gnome.Evince.appdata.xml.in b/org.gnome.Evince.appdata.xml.in
index 6a2e0d9a..2c886602 100644
--- a/org.gnome.Evince.appdata.xml.in
+++ b/org.gnome.Evince.appdata.xml.in
@@ -18,7 +18,7 @@
 <component type="desktop-application">
   <id>org.gnome.Evince</id>
   <launchable type="desktop-id">org.gnome.Evince.desktop</launchable>
-  <metadata_license>GPL-2.0+</metadata_license>
+  <metadata_license>GPL-2.0+ or GFDL-1.3-only</metadata_license>
   <project_license>GPL-2.0+</project_license>
   <_name>Evince</_name>
   <_summary>Document viewer for popular document formats</_summary>