Can not work with jQuery3.x

Uncaught TypeError: Cannot read property 'push' of undefined
    at jquery.pjax.js:981
    at jquery.pjax.js:991

L981:`$.event.props.push('state')`

Fixed with these:
```javascript
if ( $.event.props && $.inArray('state', $.event.props) < 0 ) {
  $.event.props.push('state');
} else if ( ! ('state' in $.Event.prototype) ) {
  $.event.addProp('state');
}
```