config.json in trackler-2.1.0.19

- old
+ new

@@ -244,9 +244,19 @@
             "Transforming",
             "Sequences"
          ]
       },
       {
+        "slug": "beer-song",
+        "difficulty": 3,
+        "topics": [
+          "Text formatting",
+          "Algorithms",
+          "Control-flow",
+          "Strings"
+        ]
+      },      
+      {
          "slug":"matrix",
          "difficulty":4,
          "topics":[
             "Strings",
             "Matrices",
\ No newline at end of file