Update primary programming language

README.md

@@ -410,6 +410,7 @@ It's a great way to learn.
 * [**JavaScript**: _JavaScript Algorithms and Data Structures_](https://github.com/trekhleb/javascript-algorithms)
 * [**JavaScript**: _Build a ride hailing app with React Native_](https://pusher.com/tutorials/ride-hailing-react-native)
 * [**Kotlin**: _Build Your Own Cache_](https://github.com/kezhenxu94/cache-lite)
+* [**Lua**: Building a CDN from Scratch to Learn about CDN](https://github.com/leandromoreira/cdn-up-and-running)
 * [**Nim**: _Writing a Redis Protocol Parser_](https://xmonader.github.io/nimdays/day12_resp.html)
 * [**Nim**: _Writing a Build system_](https://xmonader.github.io/nimdays/day11_buildsystem.html)
 * [**Nim**: _Writing a MiniTest Framework_](https://xmonader.github.io/nimdays/day08_minitest.html)
@@ -443,7 +444,6 @@ It's a great way to learn.
 * [**Rust**: _Building a DNS server in Rust_](https://github.com/EmilHernvall/dnsguide/blob/master/README.md)
 * [**Rust**: _Writing Scalable Chat Service from Scratch_](https://nbaksalyar.github.io/2015/07/10/writing-chat-in-rust.html)
 * [**TypeScript**: _Tiny Package Manager: Learns how npm or Yarn works_](https://github.com/g-plane/tiny-package-manager)
-* [**Various**: Building a CDN from Scratch to Learn about CDN](https://github.com/leandromoreira/cdn-up-and-running)
 
 ## Contribute 
 * Submissions welcome, just send a PR, or [create an issue](https://github.com/codecrafters-io/build-your-own-x/issues/new)