Update readme to link to the art branch of react-page

Author: chrisgadev

README.md

@@ -6,7 +6,7 @@ It provides declarative and reactive bindings to the [ART library](https://githu
 
 Using the same declarative API you can render the output to either Canvas, SVG or VML (IE8).
 
-The easiest way to get started is by testing our [react-page project](https://github.com/facebook/react-page).
+The easiest way to get started is by testing out the [art branch of the react-page project](https://github.com/facebook/react-page/tree/art).
 
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