config.json in trackler-2.0.6.37

- old
+ new

@@ -472,8 +472,13 @@
     },
     {
       "difficulty": 1,
       "slug": "variable-length-quantity",
       "topics": []
+    },
+    {
+      "difficulty": 1,
+      "slug": "forth",
+      "topics": []
     }
   ]
 }