batman-adv: Update copyright years for 2019

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
diff --git a/net/batman-adv/log.c b/net/batman-adv/log.c
index 02e55b7..f97849a 100644
--- a/net/batman-adv/log.c
+++ b/net/batman-adv/log.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2010-2018  B.A.T.M.A.N. contributors:
+/* Copyright (C) 2010-2019  B.A.T.M.A.N. contributors:
  *
  * Marek Lindner
  *