Update README.md

Author: josemoracard

.learn/exercises/04-runnig-flask/README.md

@@ -1,6 +1,6 @@
 # `04` Demo your API!
 
-Go ahead and check your API endpoint by typing this URL on your browser, and you should see the `Hello!` message like this:
+Go ahead and check your API endpoint by adding `/todos` after the URL you got from running the Flask application, and you should see the `Hello!` message like this:
 
 ![Demo your API](../../assets/check-live.gif?raw=true)
 
@@ -20,4 +20,3 @@ If running locally:
 https://localhost:3245/todos
 ```
 
-