更新readme

README.md

@@ -5,6 +5,8 @@ leetcode题解，记录自己的leecode解题之路。
 ### 简单难度
 - [20. Valid Parentheses](https://github.com/azl397985856/leetcode/blob/master/validParentheses.md)
 - [26.remove-duplicates-from-sorted-array](https://github.com/azl397985856/leetcode/blob/master/26.remove-duplicates-from-sorted-array.md)
+- [206.reverse-linked-list](./206.reverse-linked-list.md)
+
 ### 中等难度
 - [2. Add Two Numbers](https://github.com/azl397985856/leetcode/blob/master/addTwoNumbers.md)
 - [3. Longest Substring Without Repeating Characters](https://github.com/azl397985856/leetcode/blob/master/longestSubstringWithoutRepeatingCharacters.md)
@@ -13,4 +15,5 @@ leetcode题解，记录自己的leecode解题之路。
 - [24. Swap Nodes In Pairs](https://github.com/azl397985856/leetcode/blob/master/swapNodesInPairs.md)
 - [75.sort-colors.md](https://github.com/azl397985856/leetcode/blob/master/75.sort-colors.md)
 - [86.partition-list](./86.partition-list.md)
+- [92.reverse-linked-list-ii](./92.reverse-linked-list-ii.md)
 ### 高级难度
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