Fix updated version for preview-textboxes

Author: rgantzos

features/features.json

@@ -47,7 +47,7 @@
   {
     "version": 2,
     "id": "preview-textboxes",
-    "versionAdded": "v3.0.0"
+    "versionUpdated": "v3.1.0"
   },
   {
     "version": 2,