Improved README syntax

Author: javiereguiluz

README.md

@@ -55,10 +55,11 @@ This will start a web server that's accessible at http://localhost:8000.
 It will just sit and wait forever, so don't expect it to finish. You can
 quit it later when you want by pressing `ctrl + c`.
 
-    **NOTE**
-    If you're using PHP 5.3, configure your web server to point at the `web/`
-    directory of the project. For more details, see:
-    http://symfony.com/doc/current/cookbook/configuration/web_server_configuration.html
+> **NOTE**
+>
+> If you're using PHP 5.3, configure your web server to point at the `web/`
+> directory of the project. For more details, see:
+> http://symfony.com/doc/current/cookbook/configuration/web_server_configuration.html
 
 You're all done! Now just load up the application in your browser: