Update config.php

Force scope addition. Rectifies issue #5

Author: accesstechnology-mike

config/config.php

@@ -29,6 +29,7 @@
             'email',
             'profile',
             'offline_access',
+            'accounting.settings',
         ],
 
         /************************************************************************
@@ -51,4 +52,4 @@
         'url_resource_owner_details' => 'https://api.xero.com/api.xro/2.0/Organisation',
     ],
 
-];
+];