Merge pull request #315 from AyaAzzam/update-book-list

Update book list

README.md

@@ -306,8 +306,9 @@ If short on time:
 
 If you have more time (I want this book):
 
-- [ ] [Computer Architecture, Fifth Edition: A Quantitative Approach](https://www.amazon.com/dp/012383872X/)
-    - For a richer, more up-to-date (2011), but longer treatment
+- [ ] [Computer Architecture, Sixth Edition: A Quantitative Approach](https://www.amazon.com/dp/0128119055)
+    - For a richer, more up-to-date (2017), but longer treatment
+
 
 ### Language Specific