[gnome-sdk-images] Update WebKitGTK+ to 2.19.1

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 341b56c89fd7ac855102aedb52bee27f9e071087
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Nov 13 06:49:18 2017 -0600

    Update WebKitGTK+ to 2.19.1

 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 7ba626b..9e44128 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -763,8 +763,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.18.0.tar.xz";,
-                    "sha256": "b583e46a3de36a3e80ba33b084ead60512a2046aca01ff61e50e519436e5038d"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.19.1.tar.xz";,
+                    "sha256": "9f78555486ea11d53c90394da4d38a7d5b06e76d5b563182a4ed8326adc4cce5"
                 }
             ]
         },