Close #129 Enable passive option in scroll handlers

Author: caseywebdev

react-list.es6

@@ -23,6 +23,8 @@ const SIZE_KEYS = {x: 'width', y: 'height'};
 
 const NOOP = () => {};
 
+const PASSIVE = {passive: true};
+
 module.exports = class ReactList extends Component {
   static displayName = 'ReactList';
 
@@ -220,8 +222,8 @@ module.exports = class ReactList extends Component {
       prev.removeEventListener('scroll', this.updateFrame);
       prev.removeEventListener('mousewheel', NOOP);
     }
-    this.scrollParent.addEventListener('scroll', this.updateFrame);
-    this.scrollParent.addEventListener('mousewheel', NOOP);
+    this.scrollParent.addEventListener('scroll', this.updateFrame, PASSIVE);
+    this.scrollParent.addEventListener('mousewheel', NOOP, PASSIVE);
   }
 
   updateSimpleFrame(cb) {

react-list.js

@@ -100,6 +100,8 @@
 
   var NOOP = function NOOP() {};
 
+  var PASSIVE = { passive: true };
+
   _module3.default.exports = (_temp = _class = function (_Component) {
     _inherits(ReactList, _Component);
 
@@ -318,8 +320,8 @@
           prev.removeEventListener('scroll', this.updateFrame);
           prev.removeEventListener('mousewheel', NOOP);
         }
-        this.scrollParent.addEventListener('scroll', this.updateFrame);
-        this.scrollParent.addEventListener('mousewheel', NOOP);
+        this.scrollParent.addEventListener('scroll', this.updateFrame, PASSIVE);
+        this.scrollParent.addEventListener('mousewheel', NOOP, PASSIVE);
       }
     }, {
       key: 'updateSimpleFrame',