Update README.md

Geekhyt · web-flow · commit 2559b8853bc6 · 2021-01-31T21:48:54.000+08:00
diff --git a/README.md b/README.md
@@ -16,3 +16,4 @@
 - [21. 合并两个有序链表](https://github.com/Geekhyt/javascript-leetcode/issues/7)
 - [24. 两两交换链表中的节点](https://github.com/Geekhyt/javascript-leetcode/issues/8)
 - [141. 环形链表](https://github.com/Geekhyt/javascript-leetcode/issues/9)
+- [206. 反转链表](https://github.com/Geekhyt/javascript-leetcode/issues/10)
