face: add a per face counter for Interests kept by the forwarder

Refs: #4931
Change-Id: Ica1bcec02309eff4d28a55983f089355eb3096fb
diff --git a/daemon/face/face-counters.cpp b/daemon/face/face-counters.cpp
index bd3acb7..52b94ac 100644
--- a/daemon/face/face-counters.cpp
+++ b/daemon/face/face-counters.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2017,  Regents of the University of California,
+ * Copyright (c) 2014-2019,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,