fix: update StackBlitz demo link to point to the correct file

Author: nigrosimone

README.md

@@ -6,7 +6,7 @@ Cache for HTTP requests in Angular application.
 
 Sometime there is a need to cache the HTTP requests so that browser doesn’t have to hit server to fetch same data when same service is invoked serially or in parallel. `NgHttpCaching` intercept all request are made, try to retrieve a cached instance of the response and then return the cached response or send the request to the backend. Once the operation has completed cache the response.
 
-See the [stackblitz demo](https://stackblitz.com/edit/demo-ng-http-caching?file=src%2Fapp%2Fapp.component.ts).
+See the [stackblitz demo](https://stackblitz.com/edit/demo-ng-http-caching-21?file=src%2Fmain.ts).
 
 ## Features