change getItemString signature

Author: alexkuz

src/JSONArrayNode.js

@@ -78,7 +78,7 @@ export default class JSONArrayNode extends React.Component {
     if (!this.itemString) {
       this.itemString = this.props.data.length + ' item' + (this.props.data.length !== 1 ? 's' : '');
     }
-    return this.props.getItemString('Array', this.props.data, this.itemString, itemType);
+    return this.props.getItemString('Array', this.props.data, itemType, this.itemString);
   }
 
   render() {

src/JSONIterableNode.js

@@ -96,7 +96,7 @@ export default class JSONIterableNode extends React.Component {
       }
       this.itemString = count + ' entr' + (count !== 1 ? 'ies' : 'y');
     }
-    return this.props.getItemString('Iterable', this.props.data, this.itemString, itemType);
+    return this.props.getItemString('Iterable', this.props.data, itemType, this.itemString);
   }
 
   render() {

src/JSONObjectNode.js

@@ -80,7 +80,7 @@ export default class JSONObjectNode extends React.Component {
       const len = Object.keys(this.props.data).length;
       this.itemString = len + ' key' + (len !== 1 ? 's' : '');
     }
-    return this.props.getItemString('Object', this.props.data, this.itemString, itemType);
+    return this.props.getItemString('Object', this.props.data, itemType, this.itemString);
   }
 
   render() {

src/index.js

@@ -39,7 +39,7 @@ export default class JSONTree extends React.Component {
     getItemStringStyle: getEmptyStyle,
     getLabelStyle: getEmptyStyle,
     getValueStyle: getEmptyStyle,
-    getItemString: (type, data, itemString, itemType) => <span>{itemType} {itemString}</span>
+    getItemString: (type, data, itemType, itemString) => <span>{itemType} {itemString}</span>
   };
 
   constructor(props) {