Update README

README.rst

@@ -47,6 +47,7 @@ Example:
         'CLIENT_ID': 'id',
         'CLIENT_SECRET': 'secret',
         'REDIRECT_URI': 'example',
+        'ADMIN_PERMISSION': 'example_admin'
     }
 
 The available settings are:
@@ -61,6 +62,8 @@ The available settings are:
 
 ``PLATFORM_URL`` URL of platform server to connect to. Should be ``https://platform(-dev).pennlabs.org`` (no trailing slash)
 
+``ADMIN_PERMISSION`` The name of the permission on platform to grant admin access. Defaults to ``example_admin``
+
 Changelog
 ---------
 See `CHANGELOG.md <https://github.com/pennlabs/django-labs-accounts/blob/master/CHANGELOG.md>`_.