[evince] flatpak: Update libgxps to version 0.3.1

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

commit cecec4cb46431ca0f6584281bfbbab4067c91db5
Author: Jason Crain <jcrain src gnome org>
Date:   Mon Jul 15 23:45:08 2019 -0600

    flatpak: Update libgxps to version 0.3.1

 build-aux/flatpak/org.gnome.Evince.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/build-aux/flatpak/org.gnome.Evince.json b/build-aux/flatpak/org.gnome.Evince.json
index 3a1e5e3f..65bf4499 100644
--- a/build-aux/flatpak/org.gnome.Evince.json
+++ b/build-aux/flatpak/org.gnome.Evince.json
@@ -132,8 +132,8 @@
             "sources" : [
                 {
                     "type" : "archive",
-                    "url" : "http://ftp.gnome.org/pub/gnome/sources/libgxps/0.3/libgxps-0.3.0.tar.xz";,
-                    "sha256" : "412b1343bd31fee41f7204c47514d34c563ae34dafa4cc710897366bd6cd0fae"
+                    "url" : "https://ftp.gnome.org/pub/gnome/sources/libgxps/0.3/libgxps-0.3.1.tar.xz";,
+                    "sha256" : "1a939fc8fcea9471b7eca46b1ac90cff89a30d26f65c7c9a375a4bf91223fa94"
                 }
             ]
         },