security: Change to use IdentityCertificate instead of Certificate where needed.
diff --git a/ndn-cpp/security/identity/memory-identity-storage.cpp b/ndn-cpp/security/identity/memory-identity-storage.cpp
index 97b18f4..95ab69b 100644
--- a/ndn-cpp/security/identity/memory-identity-storage.cpp
+++ b/ndn-cpp/security/identity/memory-identity-storage.cpp
@@ -116,7 +116,7 @@
 }
 
 void 
-MemoryIdentityStorage::addCertificate(const Certificate& certificate)
+MemoryIdentityStorage::addCertificate(const IdentityCertificate& certificate)
 {
 #if 1
   throw std::runtime_error("MemoryIdentityStorage::addCertificate not implemented");