[latexila] Mention the official GitHub repository

[Sébastien Wilmet <swilmet src gnome org>]

commit d3882c1d79e34818e4e0028e20d0ecdb7ce780b1
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Aug 15 14:12:59 2013 +0200

    Mention the official GitHub repository
    
    I think I won't see the pull requests on this repository, so it's better
    to send the patches to bugzilla.

 HACKING |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/HACKING b/HACKING
index 657c7fa..272abe5 100644
--- a/HACKING
+++ b/HACKING
@@ -27,10 +27,9 @@ To create a patch, make first one or several commits (in another branch) and
 then use the 'git format-patch' command. You can submit your patch to the
 GNOME bugzilla.
 
-Alternatively, if you have a GitHub account, you can make a pull request.
 A GitHub repository is available, so you can fork it easily:
 
-    https://github.com/swilmet/latexila
+    https://github.com/GNOME/latexila
 
 There are some rules to follow when coding:
     - indentation: 4 spaces