Exercise order

Author: BNAndras

config.json

@@ -117,14 +117,6 @@
         ],
         "difficulty": 2
       },
-      {
-        "slug": "binary-search-tree",
-        "name": "Binary Search Tree",
-        "uuid": "f3b38287-45f2-4e17-b9a8-70382521f15c",
-        "practices": [],
-        "prerequisites": [],
-        "difficulty": 5
-      },
       {
         "slug": "bottle-song",
         "name": "Bottle Song",
@@ -818,6 +810,14 @@
         ],
         "difficulty": 5
       },
+      {
+        "slug": "binary-search-tree",
+        "name": "Binary Search Tree",
+        "uuid": "f3b38287-45f2-4e17-b9a8-70382521f15c",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
+      },
       {
         "slug": "bob",
         "name": "Bob",