Removed 2.0.0-rc6 version notice in Readme

react-router v2.0.0 has been released.

Author: chentsulin

README.md

@@ -36,7 +36,7 @@ We only store current URL and state, whereas redux-router stores the entire loca
 
 Let's take a look at a simple example.
 
-**Note:** This example uses `react-router`'s 2.0 API, which is currently released under version 2.0.0-rc6.
+**Note:** This example uses `react-router`'s 2.0 API.
 
 ```js
 import React from 'react'