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Update README.md

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Original file line number	Diff line number	Diff line change
`@@ -1697,11 +1697,17 @@ class Solution:`
`1697`	`1697`	`- 循环判断`
`1698`	`1698`	`## [268. Missing Number 1行](https://leetcode.com/problems/missing-number/)`
`1699`	`1699`	```python
	`1700`	`+class Solution:`
	`1701`	`+ def missingNumber(self, nums: List[int]) -> int:`
	`1702`	`+ return sum(range(len(nums) + 1)) - sum(nums)`
	`1703`	+```
	`1704`	`+- O(N)时间,O(1)空间(迭代器)`
	`1705`	+```python
`1700`	`1706`	`class Solution:`
`1701`	`1707`	`def missingNumber(self, nums: List[int]) -> int:`
`1702`	`1708`	`return int(len(nums) * (len(nums) + 1) / 2 - sum(nums))`
`1703`	`1709`	```
`1704`		`-- 等差数列求和公式`
	`1710`	`+- 等差数列求和公式,O(1)空间`
`1705`	`1711`	`## [278. First Bad Version 2行](https://leetcode.com/problems/first-bad-version/)`
`1706`	`1712`	```python
`1707`	`1713`	`# The isBadVersion API is already defined for you.`

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