demo($dialog): fix link to the readme

Closes #134

src/dialog/docs/readme.md

@@ -3,4 +3,4 @@ The `$dialog` service allows you to open dialogs and message boxes from within y
 Creating custom dialogs is straightforward: create a partial view, its controller and reference them when using the service.
 Generic message boxes (title, message and buttons) are also provided for your convenience.
 
-For more information, see the [dialog readme](https://github.com/angular-ui/bootstrap/src/dialog/README.md) on github.
+For more information, see the [dialog readme](https://github.com/angular-ui/bootstrap/blob/master/src/dialog/README.md) on github.