Modifying links to Git Book. New cover!

The book was released last week, and it's only now that I think to
change the cover picture. I also updated the links to reflect the
new Manning book URLs.

contact.tmpl

@@ -8,6 +8,6 @@
 <a href="http://twitter.com/rickumali" ><img src="twitter4-mod.png" border="0" alt="Follow Rick Umali on Twitter"></a>
 </p>
 <p>
-<a href="http://www.manning.com/umali" ><img src="UmaliGIT_meap_med.jpg"
+<a href="https://www.manning.com/books/learn-git-in-a-month-of-lunches" ><img src="UmaliGit-med.png"
 border="0" alt="Learn Git in a Month of Lunches by Rick Umali"></a>
 </p>

tech_start.tmpl

@@ -4,8 +4,8 @@ Below are some posts from my <a href="http://tech.rickumali.com/">technical
 BLOG</a>.
 </p>
 <p> 
-This year, I've been writing <a href="http://www.manning.com/umali/">Learn Git in a
-Month of Lunches</a> for Manning Publications.
+I'm the author of <a href="https://www.manning.com/books/learn-git-in-a-month-of-lunches">Learn Git in a
+Month of Lunches</a> (Manning Publications).
 </p>
 [% FOREACH entry = entries %]
 	<h2><a href="[% entry.url %]">[% entry.title %]</a></h2>