Add react-dropdown-tree-select

Author: mrchief

README.md

@@ -511,6 +511,7 @@ A collection of awesome things regarding React ecosystem.
 * [react-js-diagrams - A flow based diagramming library](http://github.com/woodenconsulting/react-js-diagrams/)
 * [react-file-input-previews-base64 - Wrapper around file input, with option for image previews and returning file as base64 string](https://github.com/SiDevesh/react-file-input-previews-base64)
 * [react-credit-cards - Beautiful credit cards for your payment forms](https://github.com/amarofashion/react-credit-cards)
+* [react-dropdown-tree-select - Lightweight, customizable and fast Dropdown Tree Select component for React](https://github.com/dowjones/react-dropdown-tree-select)
 
 ##### Containers
 * [Reapop - A React & Redux notifications system](https://github.com/LouisBarranqueiro/reapop)