add func renderHeaderColumn

src/FinderColumn.js

 /**
  * Created by wanli on 2017/9/15.
  */
-import React, {PureComponent} from 'react';
+import React, { PureComponent } from 'react';
 import PropTypes from 'prop-types';
 import Item from './FinderItem';
 import HeaderColumn from './FinderColumnHeader';
@@ -53,7 +53,7 @@ class FinderColumn extends PureComponent {
                     /> : ''}
                 {dataSource && dataSource.map((data, index) => (
                     <Item
-                        disabled={shouldDragDisabled && shouldDragDisabled({data})}
+                        disabled={shouldDragDisabled && shouldDragDisabled({ data })}
                         key={data[nodeKey]}
                         index={index}
                         data={data}

src/ReactFinder.js

@@ -134,9 +134,7 @@ class ReactFinder extends PureComponent {
         });
         if (el) {
             return (
-                <div className="react-finder-detail">
-                    {el}
-                </div>
+                <div className="react-finder-detail">{el}</div>
             );
         }
         return null;