Fix warn.

     -> DMLPhotoBrowser (1.0.0)
         - WARN  | [homepage] The homepage has not been updated from default
             - WARN  | [summary] The summary is not meaningful.
                 - WARN  | [iOS] [requires_arc] A value for `requires_arc` should be specified until the migration to a `true` default.
                     - WARN  | There was a problem validating the URL http://EXAMPLE/DMLPhotoBrowser.