Updated README in preparation for formal 1.0 release

Author: scotthmurray

README.md

@@ -1,10 +1,20 @@
 # d3-book
-=======
 
 These are sample code files to accompany the book “Interactive Data Visualization for the Web” by Scott Murray, published in March 2013 by O’Reilly.
 
 - [O’Reilly book page](http://shop.oreilly.com/product/0636920026938.do)
-- [Free chapter previews](http://ofps.oreilly.com/titles/9781449339739/)
+- [Online version with inline examples](http://chimera.labs.oreilly.com/books/1230000000345)
+- [Author’s website](http://alignedleft.com/)
+
+
+
+### Version
+
+**Important:** Make sure you are using the correct version of these example files!  Otherwise, the examples you see here may not exactly match the ones you see in the book.
+
+This is version **1.0**.  This release matches examples seen in the first edition of the book, published March 2013.
+
+
 
 ### License