index.html: fix join link, see #16

Author: joedf

index.html

@@ -124,7 +124,7 @@ <h1 class="blog-title">AutoHotkey on GitHub</h1>
             <h2 class="blog-post-title">Membership</h2>
             <!-- <p class="blog-post-meta">January 1, 2014 by <a href="#">Mark</a></p> -->
 
-            <p>Want to be a member of the ahkscript.org GitHub group? Join with a simple post of your GitHub username here: <a href="http://ahkscript.org/boards/viewtopic.php?t=936">http://ahkscript.org/boards/viewtopic.php?t=936</a></p>
+            <p>Want to be a member of the ahkscript.org GitHub group? Join with a simple post of your GitHub username here: <a href="https://www.autohotkey.com/boards/viewtopic.php?t=936">https://www.autohotkey.com/boards/viewtopic.php?t=936</a></p>
           </div><!-- /.blog-post -->
 
           <div class="blog-post">