git-svn: fix a typo in defining the --no-stop-on-copy option

Just a typo, I doubt anybody would use (and I highly recommend not
using) this option anyways.  But you never know...

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

contrib/git-svn/git-svn

@@ -38,7 +38,7 @@ GetOptions(	'revision|r=s' => \$_revision,
 		'edit|e' => \$_edit,
 		'rmdir' => \$_rmdir,
 		'help|H|h' => \$_help,
-		'no-stop-copy' => \$_no_stop_copy );
+		'no-stop-on-copy' => \$_no_stop_copy );
 my %cmd = (
 	fetch => [ \&fetch, "Download new revisions from SVN" ],
 	init => [ \&init, "Initialize and fetch (import)"],