Update README.md

Author: dustinmyers

README.md

@@ -44,7 +44,7 @@ When you have those completed, you're ready to start coding!
 #### Fetch the User Data
 
 - When your component mounts, send a GET request to the following URL (replacing the palceholder with your Github name):
-  - https://api.github.com/users/[your username]
+  - https://api.github.com/users/[your-username]
 - After you fetch your data, set it to state
 
 #### Display the User Data