git-remote-mediawiki: new wiki URL in documentation

The Bibzball wiki is not maintained anymore.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/mw-to-git/git-remote-mediawiki.txt

@@ -4,4 +4,4 @@ objects from mediawiki just as one would do with a classic git
 repository thanks to remote-helpers.
 
 For more information, visit the wiki at
-https://github.com/Bibzball/Git-Mediawiki/wiki
+https://github.com/moy/Git-Mediawiki/wiki