[epiphany] Fix appstream license

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 907a203a0ef94582897edb65386d3a127e69ade4
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Mar 2 11:07:09 2019 -0600

    Fix appstream license
    
    Wow, this has been wrong for a long time.
    
    Discovered by 'flatpak info org.gnome.Epiphany'

 data/org.gnome.Epiphany.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.Epiphany.appdata.xml.in b/data/org.gnome.Epiphany.appdata.xml.in
index 220d9bd0e..911bcdd15 100644
--- a/data/org.gnome.Epiphany.appdata.xml.in
+++ b/data/org.gnome.Epiphany.appdata.xml.in
@@ -33,7 +33,7 @@
   </kudos>
   <project_group>GNOME</project_group>
   <compulsory_for_desktop>GNOME</compulsory_for_desktop>
-  <project_license>GPL-2.0+</project_license>
+  <project_license>GPL-3.0+</project_license>
   <developer_name>The GNOME Project</developer_name>
   <url type="bugtracker">https://bugzilla.gnome.org/enter_bug.cgi?product=epiphany</url>
   <url type="donation">http://www.gnome.org/friends/</url>