Update README.md

Geekhyt · web-flow · commit f6073b2fab39 · 2021-02-24T18:00:12.000+08:00
diff --git a/README.md b/README.md
@@ -57,3 +57,6 @@
 - [125. 验证回文串](https://github.com/Geekhyt/javascript-leetcode/issues/35)
 - [344. 反转字符串](https://github.com/Geekhyt/javascript-leetcode/issues/36)
 - [415. 字符串相加](https://github.com/Geekhyt/javascript-leetcode/issues/37)
+
+## 动态规划
+- [70. 爬楼梯](https://github.com/Geekhyt/javascript-leetcode/issues/38)
