Update README.md

Author: reza-ebrahimi

README.md

@@ -1,4 +1,4 @@
-### LeetCode Solutions in C++ and Rust
+### LeetCode Solutions in C++, Rust and Go
 
 * Two Sum - [LeetCode Problem](https://leetcode.com/problems/two-sum)
 * Longest Substring Without Repeating Characters - [LeetCode Problem](https://leetcode.com/problems/longest-substring-without-repeating-characters)