Update README.md

Author: DuckTieCorpMember

README.md

@@ -54,7 +54,7 @@ Configure the TagBox in the DropDownBox's [fieldTemplate](https://js.devexpress.
 - **jQuery**
     - [index.js](jQuery/src/index.js)
 - **React**
-    - [App.js](React/src/App.js)
+    - [App.tsx](React/src/App.tsx)
 - **Vue**
     - [App.vue](Vue/src/App.vue)
 - **ASP.Net**