[gnome-shell] build: Bump required glib version

[Florian Müllner <fmuellner src gnome org>]

commit 0e2aeac5f9293a297162128e45ec8c2fa7e26409
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Mon Mar 19 16:44:41 2018 -0400

    build: Bump required glib version
    
    Required by 723c49a8
    
    Thanks Marcus Lundblad for identifying this issue.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 57640eb46..4bc70274e 100644
--- a/meson.build
+++ b/meson.build
@@ -18,7 +18,7 @@ ecal_req = '>= 3.5.3'
 eds_req = '>= 3.17.2'
 gcr_req = '>= 3.7.5'
 gdesktop_req = '>= 3.7.90'
-gio_req = '>= 2.53.0'
+gio_req = '>= 2.56.0'
 gi_req = '>= 1.49.1'
 gjs_req = '>= 1.47.0'
 gtk_req = '>= 3.15.0'