[evince] AppData: Mark as unremovable in GNOME Software

[Richard Hughes <rhughes src gnome org>]

commit e43739e136a96cb9bfaf347cb60aba43dccf36dc
Author: Richard Hughes <richard hughsie com>
Date:   Mon Mar 28 16:31:47 2016 +0100

    AppData: Mark as unremovable in GNOME Software

 evince.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/evince.appdata.xml.in b/evince.appdata.xml.in
index 8666b91..4bdea99 100644
--- a/evince.appdata.xml.in
+++ b/evince.appdata.xml.in
@@ -35,6 +35,7 @@
   -->
   <url type="homepage">https://wiki.gnome.org/Apps/Evince</url>
   <project_group>GNOME</project_group>
+  <compulsory_for_desktop>GNOME</compulsory_for_desktop>
   <updatecontact>https://wiki.gnome.org/Apps/Evince/ReportingBugs</updatecontact>
   <kudos>
     <kudo>AppMenu</kudo>