Update README to include manning and amazon links.

README.md

@@ -1,4 +1,5 @@
 # Deep Learning with PyTorch
-Code for the book Deep Learning with PyTorch by Eli Stevens and Luca Antiga, published by Manning Publications.
+Code for the book Deep Learning with PyTorch by Eli Stevens, Luca Antiga, and Thomas Viehmann, published by Manning Publications.
 
-In early access now!
+Manning: https://www.manning.com/books/deep-learning-with-pytorch
+Amazon: https://amzn.to/38Iwrff (affiliate link)