feat: line 추가

Author: JEONGHWANMIN

construct-binary-tree-from-preorder-and-inorder-traversal/hwanmini.js

@@ -11,4 +11,4 @@ var buildTree = function(preorder, inorder) {
     root.right = buildTree(preorder.slice(mid + 1), inorder.slice(mid + 1));
 
     return root;
-};
+};