Update README.md

Author: josemoracard

.learn/exercises/06-check-for-live/README.md

@@ -1,5 +1,5 @@
 # `06` Check the API
 
-Now you can check your endpoint live in the browser.  It should be returning the list of todos in JSON format like this:
+Now you can check your endpoint live in the browser.  It should be returning the list of todos in JSON format, like this:
 
 ![check live todos](../../assets/return_todos.gif?raw=true)