Update README

Author: soapyigu

README.md

@@ -99,7 +99,7 @@
 [Valid Palindrome](https://leetcode.com/problems/valid-palindrome/)| [Swift](./String/ValidPalindrome.swift)| Easy| O(n)| O(n)|
 [Valid Palindrome II](https://leetcode.com/problems/valid-palindrome-ii/)| [Swift](./String/ValidPalindromeII.swift)| Easy| O(n)| O(n)|
 [Detect Capital](https://leetcode.com/problems/detect-capital/)| [Swift](./String/DetectCapital.swift)| Easy| O(n)| O(1)|
-[Count and Say](https://leetcode.com/problems/count-and-say/)| [Swift](./String/CountAndSay.swift)| Easy| O(n^2)| O(n)|
+[Count and Say](https://leetcode.com/problems/count-and-say/)| [Swift](./String/CountAndSay.swift)| Easy| O(n^2)| O(1)|
 [Flip Game](https://leetcode.com/problems/flip-game/)| [Swift](./String/FlipGame.swift)| Easy| O(n)| O(n)|
 [Implement strStr()](https://leetcode.com/problems/implement-strstr/)| [Swift](./String/StrStr.swift)| Easy| O(nm)| O(n)|
 [Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings/)| [Swift](./String/IsomorphicStrings.swift)| Easy| O(n)| O(n)|