batman-adv: update copyright years for 2017

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
index 2cddaf5..2a78cdd 100644
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2014-2016  B.A.T.M.A.N. contributors:
+/* Copyright (C) 2014-2017  B.A.T.M.A.N. contributors:
  *
  * Linus Lüssing
  *