fixes DataView.refresh bug introduced with #2189

lib/DataView.js

@@ -117,7 +117,7 @@ DataView.prototype.refresh = function () {
 
   // trigger events
   if (addedIds.length) {
-    this._trigger('add', {items: added});
+    this._trigger('add', {items: addedIds});
   }
   if (removedIds.length) {
     this._trigger('remove', {items: removedIds, oldData: removedItems});
@@ -397,4 +397,4 @@ DataView.prototype._trigger = DataSet.prototype._trigger;
 DataView.prototype.subscribe = DataView.prototype.on;
 DataView.prototype.unsubscribe = DataView.prototype.off;
 
-module.exports = DataView;
+module.exports = DataView;