Update index.zh.html

git-for-windows 地址换了

Author: yanhaijing

index.zh.html

@@ -68,7 +68,7 @@ <h2>安装</h2>
             <a href="http://code.google.com/p/git-osx-installer/downloads/list?can=3">下载 git OSX 版</a>
         </p>
         <p>
-            <a href="http://msysgit.github.io/">下载 git Windows 版</a>
+            <a href="http://git-for-windows.github.io/">下载 git Windows 版</a>
         </p>
         <p>
             <a href="http://book.git-scm.com/2_installing_git.html">下载 git Linux 版</a>