[gnome-sdk-images] Update to latest webkitgtk4

[Alexander Larsson <alexl src gnome org>]

commit bb3455e632a9754532bbc271b05fc4b0b13c11d4
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Apr 4 21:43:57 2017 +0200

    Update to latest webkitgtk4

 org.gnome.Sdk.json.in |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 9e4e15e..958ba9b 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -771,8 +771,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.16.0.tar.xz";,
-                    "sha256": "5ea371d8910ef3ce7f7d087242c5646f8f3073a5298287c9eb60e055ec107cdc"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.16.1.tar.xz";,
+                    "sha256": "eb92383232328ce655b703c64370ed3795662479719ad1b4a869ed46769d2945"
                 },
                 {
                     "type": "patch",