Undeprecate replaceReducer

Author: gaearon

docs/api/Store.md

@@ -119,11 +119,6 @@ handleChange();
 
 ### <a id='replaceReducer'></a>[`replaceReducer(nextReducer)`](#replaceReducer)
 
->##### Deprecated
-
->This API has been [deprecated](https://github.com/rackt/redux/issues/350).  
->It will be removed when we find a better solution for this problem.
-
 Replaces the reducer currently used by the store to calculate the state.
 
 It is an advanced API. You might need this if your app implements code splitting, and you want to load some of the reducers dynamically. You might also need this if you implement a hot reloading mechanism for Redux.