change value offset default from null to 0, this will prevent error NaN marginLeft

Author: Aditya Rahmanto

dist/js/index.js

@@ -28,10 +28,10 @@ var Switch = function (_React$Component) {
   function Switch(props) {
     _classCallCheck(this, Switch);
 
-    var _this = _possibleConstructorReturn(this, Object.getPrototypeOf(Switch).call(this, props));
+    var _this = _possibleConstructorReturn(this, (Switch.__proto__ || Object.getPrototypeOf(Switch)).call(this, props));
 
     _this.state = {
-      offset: null,
+      offset: 0,
       skipAnimation: true,
       dragStart: false,
       focus: false,

src/js/index.js

@@ -7,7 +7,7 @@ export default class Switch extends React.Component {
     super(props);
 
     this.state = {
-      offset: null,
+      offset: 0,
       skipAnimation: true,
       dragStart: false,
       focus: false,