Update copyright notices for files modified in 2016

refs #3415

Change-Id: I821327abf9e6715de0d8516f5ffb87487236ee14
diff --git a/src/encoding/encoder.cpp b/src/encoding/encoder.cpp
index 3c15943..12b5ea1 100644
--- a/src/encoding/encoder.cpp
+++ b/src/encoding/encoder.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2015 Regents of the University of California.
+ * Copyright (c) 2013-2016 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *