config.json in trackler-2.0.8.16

- old
+ new

@@ -214,9 +214,18 @@
         "filtering",
         "mathematics"
       ]
     },
     {
+      "slug": "rotational-cipher",
+      "difficulty": 2,
+      "topics": [
+        "string literals",
+        "metaprogramming",
+        "strings"
+      ]
+    },
+    {
       "slug": "custom-set",
       "difficulty": 5,
       "topics": [
         "types",
         "parametric types",