lp: add CongestionMark field and tag

refs #3797

Change-Id: I6ac6663c874abde1df2102af81fc03567ad87029
diff --git a/src/lp/tlv.hpp b/src/lp/tlv.hpp
index 3231660..e7a5cca 100644
--- a/src/lp/tlv.hpp
+++ b/src/lp/tlv.hpp
@@ -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).
  *
@@ -40,7 +40,8 @@
   NextHopFaceId = 816,
   CachePolicy = 820,
   CachePolicyType = 821,
-  IncomingFaceId = 817
+  IncomingFaceId = 817,
+  CongestionMark = 832
 };
 
 enum {