documentation.md in activeadmin-2.7.0

- old
+ new

@@ -27,10 +27,10 @@
 configurations.
 
 Migrate your db and start the server:
 
 ```bash
-$> rake db:migrate
+$> rails db:migrate
 $> rails server
 ```
 
 Visit `http://localhost:3000/admin` and log in using:
 