config.json in trackler-2.2.1.81

- old
+ new

@@ -26,9 +26,19 @@
         "booleans",
         "logic"
       ]
     },
     {
+      "uuid": "d39f86fe-db56-461c-8a93-d87058af8366",
+      "slug": "reverse-string",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 1,
+      "topics": [
+        "strings"
+      ]
+    },
+    {
       "uuid": "d1a98c79-d3cc-4035-baab-0e334d2b6a57",
       "slug": "isogram",
       "core": false,
       "unlocked_by": null,
       "difficulty": 1,