[gnome-sdk-images/gnome-3-24] Upgrade to WebKitGTK+ 2.20.2

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 98b04076d37cd7ba1ebec9d01562093cab460d00
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon May 7 09:06:36 2018 -0500

    Upgrade to WebKitGTK+ 2.20.2

 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 a1f6f7c..2ef3b83 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -605,8 +605,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.20.0.tar.xz";,
-                    "sha256": "57f640f720bd9a8a7207f3321cf803a15c2f207b4e7b75ff1be17bc1eeb00a3c"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.20.2.tar.xz";,
+                    "sha256": "dffe93a241f03f1c73b369f4e323e4d8f12e39d33d5515948cbf454ca4b526e2"
                 },
                 {
                     "type": "patch",