Update README.md to include release date and links to book sites

Author: koendehondt

README.md

@@ -1,8 +1,8 @@
 # BuildingApplicationWithSpec2
 
-This project contains the forth coming book for Spec 2.0: the UI builder framework of Pharo.
-The release date for the book is December 2023.
+This project contains the sources of the Pharo book "Application Building with Spec 2.0".
+The book has been released on October 27, 2024. It is available at [BoD](https://librairie.bod.fr/building-application-with-spec-2-0-koen-de-hondt-9782322478712) (Books on Demand) and [Amazon](https://a.co/d/fIvRcSO).
 
 - [Latest build of the book](https://github.com/SquareBracketAssociates/BuildingApplicationWithSpec2/releases/download/latest/BuildingUIWithSpec.pdf)
 - The code of all the book examples is stored at [https://github.com/SquareBracketAssociates/CodeOfSpec20Book](https://github.com/SquareBracketAssociates/CodeOfSpec20Book)
-- Previous and older versions may be at [https://github.com/Ducasse/SpecBookCode/](https://github.com/Ducasse/SpecBookCode/)
+- Previous and older versions can be found at [https://github.com/Ducasse/SpecBookCode/](https://github.com/Ducasse/SpecBookCode/)