src: Update source code to use new API and fix compilation errors due to missing headers

Change-Id: I295fbcdcd6ab114a565d9b7531387728a6596884
Refs: 1629
diff --git a/src/repo-command-response.hpp b/src/repo-command-response.hpp
index 0eb4f1d..92b390b 100644
--- a/src/repo-command-response.hpp
+++ b/src/repo-command-response.hpp
@@ -21,6 +21,7 @@
 #define REPO_REPO_COMMAND_RESPONSE_HPP
 
 #include <ndn-cxx/encoding/block.hpp>
+#include <ndn-cxx/encoding/block-helpers.hpp>
 #include <ndn-cxx/encoding/encoding-buffer.hpp>
 #include <ndn-cxx/encoding/tlv-nfd.hpp>
 #include "repo-tlv.hpp"