Update 190407-trim_bst.md

super-fishz · Apr 6, 2019 · b092cb4 · b092cb4
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-# [Trim BST]()
+# [Trim BST](https://leetcode.com/problems/trim-a-binary-search-tree/)
 ## Problem
 ## Solve
 ```kotlin