Clarify the goal of this library (#387)

Author: gaearon

README.md

@@ -12,6 +12,8 @@ But the two libraries don't coordinate. You want to do time travel with your app
 
 This library helps you keep that bit of state in sync with your Redux store. We keep a copy of the current location hidden in state. When you rewind your application state with a tool like [Redux DevTools](https://github.com/gaearon/redux-devtools), that state change is propagated to React Router so it can adjust the component tree accordingly. You can jump around in state, rewinding, replaying, and resetting as much as you'd like, and this library will ensure the two stay in sync at all times.
 
+**This library is not _necessary_ for using Redux together with React Router. You can use the two together just fine without any additional libraries. It is useful if you care about recording, persisting, and replaying user actions, using time travel. If you don't care about these features, just [use Redux and React Router directly](http://stackoverflow.com/questions/36722584/how-to-sync-redux-state-and-url-hash-tag-params/36749963#36749963).**
+
 ## Installation
 
 ```