Add childrenProperty to api docs

Author: Philipp Alferov

index.js

@@ -60,10 +60,10 @@ var groupByParents = function(array, options) {
  * @param {Object} options An object containing the following fields:
  *
  *  - `parentProperty` (String): A name of a property where a link to
- *    a parent node could be found. Default: 'parent_id'
+ * a parent node could be found. Default: 'parent_id'
  *  - `customID` (String): An unique node identifier. Default: 'id'
- *  - `childrenProperty` (String): A name of a property where chilren nodes
- *    are going to be stored. Default: 'children'.
+ *  - `childrenProperty` (String): A name of a property where children nodes
+ * are going to be stored. Default: 'children'.
  *
  * @return {Array} Result of transformation
  */

readme.md

@@ -101,8 +101,9 @@ Convert a plain array of nodes (with pointers to parent nodes) to a a nested dat
 
 - **Array** `data`: An array of data
 - **Object** `options`: An object containing the following fields:
-  - `parentProperty` (String): A name of a property where a link to a parent node could be found. Default: 'parent_id'
-  - `customID` (String): An unique node identifier. Default: 'id'
+  - `parentProperty` (String): A name of a property where a link to a parent node could be found. Default: 'parent_id'.
+  - `childrenProperty` (String): A name of a property where children nodes are going to be stored. Default: 'children'.
+  - `customID` (String): An unique node identifier. Default: 'id'.
 
 #### Return