Update README.md (microsoft#392)

erikschlegel · rozele · commit ba9ab6b5ba9b · 2016-05-16T15:12:08.000-04:00
Fixing readme which has the wrong clone repo reference.
diff --git a/ReactWindows/Playground/README.md b/ReactWindows/Playground/README.md
@@ -12,7 +12,7 @@ Assuming you have [Visual Studio 2015 Enterprise](\\products\PUBLIC\Products\Dev
 
 Clone this repo onto your local machine.
 ```
-git clone https://github.com/CatalystCode/react-native.git
+git clone https://github.com/ReactWindows/react-native.git
 cd react-native
 git fetch
 git checkout ReactWindows
