message: Change message structure
diff: @@ -613,7 +613,9 @@ function Facebookbot(configuration) {
  var attachment_upload_api = {
  upload: function(attachment, cb) {
  var message = {
  + message : {
  attachment: attachment
  + }
  };
  request.post('https://' + api_host + '/v2.6/me/message_attachments?access_token=' + configuration.access_token,
  