[gimp-web/testing] Update a book's URL

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit a89d2cf3df4e5f7b3685c75d1dde53a942507e34
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Thu Dec 24 01:32:14 2015 +0300

    Update a book's URL

 content/books/index.md |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/content/books/index.md b/content/books/index.md
index e784ce6..83b21b7 100644
--- a/content/books/index.md
+++ b/content/books/index.md
@@ -59,7 +59,7 @@ The exercise photos in the book are available to download for the reader to foll
  **ISBN-10:** N/A  
  **ISBN-13:** N/A  
  **Publisher/Date:** Self-published/May 2013  
- **Website:** [http://how-to-gimp.com/gimp-book/](http://how-to-gimp.com/gimp-book/)  
+ **Website:** [http://howtogimp.com/gimp-book/](http://howtogimp.com/gimp-book/)  
 
 **Description:** A beginner's guide to using GIMP for photo editing, and basic graphics like using text on 
images. The book starts from the very beginning. You'll work through clearly written tutorials using over 30 
high quality practice images to learn everything from drawing simple shapes, to using advanced tools like 
layers, and layer masks. You'll learn how to use tools effectively, rather than on memorizing steps in 
tutorials. By the end of the book, you'll be ready to follow and adapt online tutorials with ease. You'll 
even have the confidence to use GIMP without tutorials.