MAINTAINERS: Mark BATMAN ADVANCED mailing list as moderated

The mailing list of b.a.t.m.a.n@lists.open-mesh.org is moderated for
non-subscribers and non-whitelisted addresses. Such mails will be delayed
but the sender will not be informed about the moderation.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Antonio Quartulli <a@unstable.cc>

MAINTAINERS

@@ -2203,7 +2203,7 @@ BATMAN ADVANCED
 M:	Marek Lindner <mareklindner@neomailbox.ch>
 M:	Simon Wunderlich <sw@simonwunderlich.de>
 M:	Antonio Quartulli <a@unstable.cc>
-L:	b.a.t.m.a.n@lists.open-mesh.org
+L:	b.a.t.m.a.n@lists.open-mesh.org (moderated for non-subscribers)
 W:	https://www.open-mesh.org/
 Q:	https://patchwork.open-mesh.org/project/batman/list/
 S:	Maintained