message: update closest-binary-search-tree-value.py
  * update closest-binary-search-tree-value.py
  make it a bit clear
  * Update closest-binary-search-tree-value.py
diff: @@ -13,12 +13,11 @@ class Solution(object):
  while root:
  if abs(root.val - target) < gap:
  gap = abs(root.val - target)
  - closest = root
  + closest = root.val
  if target == root.val:
  break
  elif target < root.val:
  root = root.left
  else:
  root = root.right
  - return closest.val
  -
  + return closest
  