update Source Tree for Windows

I've been using it for 2 months.

Author: tomByrer

index.html

@@ -210,7 +210,7 @@ <h3>graphical clients</h3>
             <ul>
                 <li><a href="http://gitx.laullon.com/">GitX (L) (OSX, open source)</a></li>
                 <li><a href="http://www.git-tower.com/">Tower (OSX)</a></li>
-                <li><a href="http://www.sourcetreeapp.com/">Source Tree (OSX, free)</a></li>
+                <li><a href="http://www.sourcetreeapp.com/">Source Tree (OSX & Windows, free)</a></li>
                 <li><a href="http://mac.github.com/">GitHub for Mac (OSX, free)</a></li>
                 <li><a href="https://itunes.apple.com/gb/app/gitbox/id403388357?mt=12">GitBox (OSX, App Store)</a></li>
             </ul>