[gnome-boxes] wizard-downloads-page: Bump recommended downloads list

[Felipe Borges <felipeborges src gnome org>]

commit 201f6adc6a895648055a29422d685c85975a5e6f
Author: Felipe Borges <felipeborges gnome org>
Date:   Thu Aug 9 11:54:38 2018 +0200

    wizard-downloads-page: Bump recommended downloads list
    
    We should offer the latest versions of each of the recommended
    OSes.
    
    For the future releases it would be better to develop a process
    of finding the latest release of each entry automatically. Also
    downstreams should have an easier way to patch the list to
    include offers of their choice.

 src/wizard-downloads-page.vala | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/src/wizard-downloads-page.vala b/src/wizard-downloads-page.vala
index fb30cce2..435aaf5d 100644
--- a/src/wizard-downloads-page.vala
+++ b/src/wizard-downloads-page.vala
@@ -21,11 +21,23 @@
     private Gtk.ListBox recommended_listbox;
 
     private GLib.ListStore recommended_model;
+
+    /* These are OSes listed in the recommended section of the
+     * "Download an OS" page.
+     *
+     * This list is powered by libosinfo, therefore the URLs are
+     * unique identifiers for each OS in osinfo-db.
+     *
+     * Downstreams are encouraged to tweak the list as they wish.
+     * Sorting is also available.
+     */
     private string[] recommended_downloads = {
-        "http://redhat.com/rhel/7.4";,
-        "http://ubuntu.com/ubuntu/17.10";,
+        "http://redhat.com/rhel/7.5";,
+        "http://fedoraproject.org/fedora/28";,
+        "http://fedoraproject.org/silverblue/28";,
+        "http://ubuntu.com/ubuntu/18.04";,
         "http://opensuse.org/opensuse/42.3";,
-        "http://fedoraproject.org/fedora/27";,
+        "http://debian.org/debian/9";,
     };
 
     private WizardDownloadsPageView _page;