doc: fix link to example design

Author: evanlucas

README.md

@@ -16,7 +16,7 @@ The 3 priorities that we provide you are:
 
 Note: The example design below.
 
-![Example Design](https://raw.githubusercontent.com/helpdotcom/react-coding-challenge/master/grid.png)
+![Example Design](https://github.com/helpdotcom/react-coding-challenge/raw/master/grid.png)
 
 
 2. The messages should be color coded depending on the priority of the message. The appropriate color per priority is: