Add beta to name in readme

README.md

@@ -1,6 +1,6 @@
 # React Hot Loader 3 [![npm package](https://img.shields.io/npm/v/react-hot-loader.svg?style=flat-square)](https://www.npmjs.org/package/react-hot-loader)
 
-### React Hot Loader 3 has arrived!
+### React Hot Loader 3 beta has arrived!
 
 It fixes some long-standing issues with both React Hot Loader and React Transform.
 
@@ -40,7 +40,7 @@ If you'd rather stay with **Browserify**, check out **[LiveReactload](https://gi
 
 ## Known limitations
 
-- React Router v3 is not fully supported. If you want to get most of React Hot Loader, consider switching to [React Router v4](https://reacttraining.com/react-router/) (Note: it's currently in beta!). If you want to understand the reasoning, it's good to start in [React Router v4 FAQ](https://github.com/ReactTraining/react-router/blob/v4/README.md#v4-faq)
+- React Router v3 is not fully supported (e.g. async routes). If you want to get most of React Hot Loader, consider switching to [React Router v4](https://reacttraining.com/react-router/) (Note: it's currently in beta!). If you want to understand the reasoning, it's good to start in [React Router v4 FAQ](https://github.com/ReactTraining/react-router/blob/v4/README.md#v4-faq)
 
 ## The Talk