Update Gutenberg reference.

SergioEstevao · SergioEstevao · commit 0e38e2bb1d67 · 2018-08-01T15:07:34.000+01:00
diff --git a/gutenberg b/gutenberg
@@ -1 +1 @@
-Subproject commit bed493bf324a57fa818715185783412c0f764602
+Subproject commit 3351260b9903816fa104fd873a56d529efb78209
