[gnome-sdk-images/gnome-3-20] Update to gtk 3.20.4

[Alexander Larsson <alexl src gnome org>]

commit bc6b83f1d1790a8dbfdeb5be886fbb67068379e6
Author: Alexander Larsson <alexl redhat com>
Date:   Tue May 10 10:36:34 2016 +0200

    Update to gtk 3.20.4

 org.gnome.Sdk.json |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Sdk.json b/org.gnome.Sdk.json
index 51e774a..34c3ddb 100644
--- a/org.gnome.Sdk.json
+++ b/org.gnome.Sdk.json
@@ -325,8 +325,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://download.gnome.org/sources/gtk+/3.20/gtk+-3.20.3.tar.xz";,
-                    "sha256": "3834f3bf23b260b3e5ebfea41102e2026a8af29e36c3620edf4a5cf05e82f694"
+                    "url": "https://download.gnome.org/sources/gtk+/3.20/gtk+-3.20.4.tar.xz";,
+                    "sha256": "e7e3aaf54a54dd1c1ca0588939254abe31329e0bcd280a12290d5306b41ea03f"
                 }
             ]
         },