Change link to github page.

Author: Diego Nehab

doc/index.html

@@ -94,8 +94,8 @@ <h2 id=download>Download</h2>
 </p>
 
 <p>
-The library can be downloaded in source code from the
-<a href="https://github.com/diegonehab/luasocket/downloads">LuaSocket
+The current version of the library can be found at
+the <a href="https://github.com/diegonehab/luasocket">LuaSocket
 project page</a> on GitHub. Besides the full C and Lua source code 
 for the library, the distribution contains several examples, 
 this user's manual and basic test procedures.