feat(README): update

Author: ryoppippi

README.md

@@ -2,9 +2,7 @@
 
 [![LeetCode user ryoppippi](https://img.shields.io/badge/dynamic/json?style=for-the-badge&labelColor=black&color=%23ffa116&label=Solved&query=solved&url=https%3A%2F%2Fleetcode-badge.vercel.app%2Fapi%2Fusers%2Fryoppippi&logo=leetcode&logoColor=yellow)](https://leetcode.com/ryoppippi/)
 
-## TODO
-
-- [ ] Add `flake.nix` currently I use `nix run github:clearloop/leetcode-cli`)
+I use [leetcode.nvim](https://github.com/kawre/leetcode.nvim) to fetch problems
 
 ## LICENSE