[gnome-chess] help: Use https link

[Andre Klapper <aklapper src gnome org>]

commit b3174a479082fb127c27d1a35b3ee993b233e4b9
Author: Andre Klapper <a9016009 gmx de>
Date:   Wed Sep 5 10:15:28 2018 +0200

    help: Use https link

 help/C/develop.page | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/develop.page b/help/C/develop.page
index 194efc6..6d785a5 100644
--- a/help/C/develop.page
+++ b/help/C/develop.page
@@ -21,7 +21,7 @@
   The <app>GNOME Games</app> are developed and maintained by a volunteer community.  You are welcome to 
participate.
  </p>
  <p>
-   If you would like to <link href="https://wiki.gnome.org/Apps/Games/Contributing";>help develop <app>GNOME 
Games</app></link>, you can get in touch with the developers using <link 
href="https://cbe005.chat.mibbit.com/?url=irc%3A%2F%2Firc.gnome.org%2Fgnome-games";>irc</link>, or via our 
<link href="http://mail.gnome.org/mailman/listinfo/games-list";>mailing list</link>.
+   If you would like to <link href="https://wiki.gnome.org/Apps/Games/Contributing";>help develop <app>GNOME 
Games</app></link>, you can get in touch with the developers using <link 
href="https://cbe005.chat.mibbit.com/?url=irc%3A%2F%2Firc.gnome.org%2Fgnome-games";>irc</link>, or via our 
<link href="https://mail.gnome.org/mailman/listinfo/games-list";>mailing list</link>.
  </p>
 
 </page>