rebaes to the new master branch from named-data/ndncert

Change-Id: I4d40daa5d1047a02fe814c464c73f06666c73bc7
diff --git a/src/ndncert-common.hpp b/src/ndncert-common.hpp
index ce43640..a6a7a04 100644
--- a/src/ndncert-common.hpp
+++ b/src/ndncert-common.hpp
@@ -46,7 +46,7 @@
 #include <ndn-cxx/encoding/block.hpp>
 #include <ndn-cxx/lp/nack.hpp>
 #include <ndn-cxx/security/key-chain.hpp>
-#include <ndn-cxx/security/certificate.hpp>
+#include <ndn-cxx/security/v2/certificate.hpp>
 
 #include <boost/algorithm/string.hpp>
 #include <boost/assert.hpp>