fix: typescript reference on readme (#492)

Author: drochetti

README.md

@@ -4,7 +4,7 @@
 
 On top of accelerating web applications, Turbo was built from the ground-up to form the foundation of hybrid native applications. Write the navigational shell of your [Android](https://github.com/hotwired/turbo-android) or [iOS](https://github.com/hotwired/turbo-ios) app using the standard platform tooling, then seamlessly fill in features from the web, following native navigation patterns. Not every mobile screen needs to be written in Swift or Kotlin to feel native. With Turbo, you spend less time wrangling JSON, waiting on app stores to approve updates, or reimplementing features you've already created in HTML.
 
-Turbo is a language-agnostic framework written in TypeScript, but this gem builds on top of those basics to make the integration with Rails as smooth as possible. You can deliver turbo updates via model callbacks over Action Cable, respond to controller actions with native navigation or standard redirects, and render turbo frames with helpers and layout-free responses.
+Turbo is a language-agnostic framework written in JavaScript, but this gem builds on top of those basics to make the integration with Rails as smooth as possible. You can deliver turbo updates via model callbacks over Action Cable, respond to controller actions with native navigation or standard redirects, and render turbo frames with helpers and layout-free responses.
 
 
 ## Navigate with Turbo Drive