update book

Author: tony

doc/_templates/book.html

@@ -1,8 +1,7 @@
-<h3>Book Pre-order</h3>
+<h3>Buy the book!</h3>
 
 <p><img src="https://s3.amazonaws.com/titlepages.leanpub.com/the-tao-of-tmux/large"></p>
 
-<p>Get your copy of the <em>The Tao of tmux</em> on <a class="reference external" href="https://leanpub.com/the-tao-of-tmux">Leanpub</a> and <a class="reference external" href="http://amzn.to/2gPfRhC">Kindle</a> (Amazon).
-The final version will be delivered to you January 2017.</p>
+<p>Get your copy of the <em>The Tao of tmux</em> on <a class="reference external" href="https://leanpub.com/the-tao-of-tmux">Leanpub</a> and <a class="reference external" href="http://amzn.to/2gPfRhC">Kindle</a> (Amazon).</p>
 <p>Read and browse the book for <a class="reference external" href="https://leanpub.com/the-tao-of-tmux/read">free on the web</a>.</p>
 <a class="reference external image-reference" href="http://amzn.to/2gPfRhC"><img alt="Amazon Kindle" src="https://www.git-pull.com/_images/amazon-logo.png" width="45%"></a>