Add missing dispatcher header to fix compilation

Change-Id: I7a7c637e74974c546bfc2c70fa39e850e8dbeaa2
diff --git a/src/update/nfd-rib-command-processor.hpp b/src/update/nfd-rib-command-processor.hpp
index 8d9cba6..a022b58 100644
--- a/src/update/nfd-rib-command-processor.hpp
+++ b/src/update/nfd-rib-command-processor.hpp
@@ -30,6 +30,7 @@
 
 #include <ndn-cxx/mgmt/nfd/control-command.hpp>
 #include <ndn-cxx/mgmt/nfd/control-parameters.hpp>
+#include <ndn-cxx/mgmt/dispatcher.hpp>
 #include <ndn-cxx/encoding/tlv-nfd.hpp>
 
 #include <boost/noncopyable.hpp>