docs(tell-me-how-many): update link to resource

subjects/tell-me-how-many/README.md

@@ -27,7 +27,7 @@ directory
 
 ### Provided files
 
-Download [`guests.zip`](../guests.zip)
+Download [`guests.zip`](./resources/guests.zip)
 to have at your disposal the `guests` directory containing the files to count in
 your script. You must save it in your `tell-me-how-many` exercise directory to test
 your script on it.