[gnome-sdk-images/gnome-3-26] Update to WebKitGTK+ 2.20.3

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a5a86a699586d85cbb7a47745d4c941a7dc9e08c
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Jun 11 14:17:12 2018 -0500

    Update to WebKitGTK+ 2.20.3

 org.gnome.Sdk.json.in | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 02f0989..f954192 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -669,8 +669,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.20.2.tar.xz";,
-                    "sha256": "dffe93a241f03f1c73b369f4e323e4d8f12e39d33d5515948cbf454ca4b526e2"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.20.3.tar.xz";,
+                    "sha256": "d30dc877f71af260f9f7ce0a75544ee9cc38747b3889023bf7ff4c83e8b2b8dd"
                 },
                 {
                     "type": "patch",