Use newer example curriculum

docs/curriculum.md

 then keep track of the current lesson and progress via TensorBoard.
 
 
-```
+```json
-    "thresholds" : [0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5],
+    "thresholds" : [0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5],
-        "min_wall_height" : [1, 1, 1, 2, 2, 3, 3, 4, 5],
-        "max_wall_height" : [2, 3, 4, 4, 5, 5, 6, 6, 6]
+        "min_wall_height" : [0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5],
+        "max_wall_height" : [1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0]
     }
 }
 ```