Include version on cover page

joaoventura · joaoventura · commit ddc3968c719e · 2018-03-19T18:53:14.000Z
diff --git a/book.tex b/book.tex
@@ -43,7 +43,7 @@
 
 \title{At full speed with Python}
 \author{João Ventura}
-\date{}
+\date{v0.1}
 
 \maketitle
 
