[gnome-sdk-images] Update to WebKitGTK+ 2.19.90

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b41003f60620e636ef6627537f410ffe5b226848
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Feb 5 11:09:45 2018 -0600

    Update to WebKitGTK+ 2.19.90

 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 500c1c3..81931ed 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -789,8 +789,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.19.6.tar.xz";,
-                    "sha256": "c97c87a0db3814f97812edeadc79c330affa51eb43dadbdc7a764b01db38d82b"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.19.90.tar.xz";,
+                    "sha256": "18819bdf6660ce49609ca2bcc46572ae7a1fb657e1296adc4f199869ed43542b"
                 }
             ]
         },