config.json in trackler-2.2.0.1

- old
+ new

@@ -296,8 +296,16 @@
       "slug": "allergies",
       "topics": [
         "bitwise operations",
         "filtering"
       ]
+    },
+    {
+      "difficulty": 3,
+      "slug": "atbash-cipher",
+      "topics": [
+        "strings",
+        "algorithms"
+      ]
     }
   ]
 }