Use a simpler amazon link in the pdf book

Author: marijnh

19_paint.md

@@ -42,15 +42,15 @@ We will structure the editor interface as a number of
 _((component))s_, objects that are responsible for a piece of the
 ((DOM)), and may contain other components inside them.
 
-The ((state)) of the application consists of the picture, the selected
-tool, and the selected color. We'll set things up so that the state
-lives in a single value, and the interface components always base the
-way they look on the current state.
+The ((state)) of the application consists of the current picture, the
+selected tool, and the selected color. We'll set things up so that the
+state lives in a single value, and the interface components always
+base the way they look on the current state.
 
 To see why this is important, let's consider the
 alternative—distributing pieces of state throughout the interface. Up
-to a certain point, this is much easier to program. We can just put in
-a ((color field)), wire it up to store its value somewhere when it
+to a certain point, this is easier to program. We can just put in a
+((color field)), wire it up to store its value somewhere when it
 changes, and have all operations that need to know the current color
 look at that value.
 

pdf/book.tex

@@ -110,7 +110,7 @@
 
   \noindent You can buy a print version of this book, with an extra
   bonus chapter included, printed by No Starch Press at
-  \url{http://www.amazon.com/gp/product/1593275846/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1593275846&linkCode=as2&tag=marijhaver-20&linkId=VPXXXSRYC5COG5R5}.
+  \url{https://www.amazon.com/Eloquent-JavaScript-2nd-Ed-Introduction/dp/1593275846}.
 
 \tableofcontents