Update README.md

Author: CESARDELATORRE

README.md

@@ -70,7 +70,7 @@ You can download them and start reviewing these Guides/eBooks here:
 | Architecting & Developing | Containers Lifecycle & CI/CD | App patterns with Xamarin.Forms |
 | ------------ | ------------|  ------------|
 | <a href='https://aka.ms/microservicesebook'><img src="img/ebook_arch_dev_microservices_containers_cover.png"> </a> | <a href='https://aka.ms/dockerlifecycleebook'> <img src="img/ebook_containers_lifecycle.png"> </a> | <a href='https://aka.ms/xamarinpatternsebook'> <img src="img/xamarin-enterprise-patterns-ebook-cover-small.png"> </a> |
-| <sup> <a href='https://aka.ms/microservicesebook'>**Download .PDF** (2nd Edition)</a> </sup>  | <sup> <a href='https://aka.ms/dockerlifecycleebook'>**Download** </a>  </sup> | <sup> <a href='https://aka.ms/xamarinpatternsebook'>**Download**  </a>  </sup> |
+| <sup> <a href='https://aka.ms/microservicesebook'>**Download .PDF** (v2.1 Edition)</a> </sup>  | <sup> <a href='https://aka.ms/dockerlifecycleebook'>**Download** </a>  </sup> | <sup> <a href='https://aka.ms/xamarinpatternsebook'>**Download**  </a>  </sup> |
 
 Download in other formats (**eReaders** like **MOBI**, **EPUB**) and other eBooks at the [.NET Architecture center](http://dot.net/architecture).