go-counting: Fix README.md wrong format

Author: yunchih

exercises/go-counting/README.md

@@ -33,7 +33,7 @@ For more information see
 [wikipedia](https://en.wikipedia.org/wiki/Go_%28game%29) or [Sensei's
 Library](http://senseis.xmp.net/).
 
-### Submitting Exercises
+## Submitting Exercises
 
 Note that, when trying to submit an exercise, make sure the solution is in the `exercism/python/<exerciseName>` directory.