Updated text for download page

Author: gcarcassi

book.tex

@@ -81,7 +81,7 @@
 \ifdraft 
 \noindent \textbf{This book is a work in progress}. This draft is a development copy built on \today. It is provided as-is for the purpose of early review and feedback. You can get the latest draft from \url{https://assumptionsofphysics.org/book}. 
 \else
-\noindent This edition was finalized on \bookdate. For changes since then, you can get the latest draft from \url{https://assumptionsofphysics.org/book}.
+\noindent This edition was finalized on \bookdate. Older and newer versions can be found at  \url{https://assumptionsofphysics.org/book}.
 \fi
 
 \newpage