[gnome-boxes] Update version of openSUSE to current

[Felipe Borges <felipeborges src gnome org>]

commit dd2b8de57f08d847b9817605506e153b5d1f9945
Author: Stasiek Michalski <hellcp opensuse org>
Date:   Fri Mar 16 21:37:39 2018 +0000

    Update version of openSUSE to current

 src/wizard-source.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index e209bc7e..69d9537f 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -319,7 +319,7 @@ private void on_notify_estimated_load_progress () {
 
     private string[] recommended_downloads = {
         "http://ubuntu.com/ubuntu/16.04";,
-        "http://opensuse.org/opensuse/42.2";,
+        "http://opensuse.org/opensuse/42.3";,
         "http://fedoraproject.org/fedora/27";,
     };