Remove master warning now that we have next.

Author: timdorr

README.md

@@ -7,8 +7,6 @@ React Router keeps your UI in sync with the URL. It has a simple API with powerf
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-> **Important:** *This is the `master` branch of React Router and may contain changes that are not yet released. To see the code for the most recently published release, browse [the `latest` tag](https://github.com/reactjs/react-router/tree/latest).*
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 ### Docs & Help
 
 - [Tutorial - Do This First!](https://github.com/reactjs/react-router-tutorial)