Update copyrights in c++ tests

src/test/mempool_tests.cpp

@@ -1,3 +1,4 @@
+// Copyright (c) 2019-2020 The Hush developers
 // Copyright (c) 2011-2014 The Bitcoin Core developers
 // Distributed under the GPLv3 software license, see the accompanying
 // file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
@@ -6,9 +7,7 @@
 #include "main.h"
 #include "txmempool.h"
 #include "util.h"
-
 #include "test/test_bitcoin.h"
-
 #include <boost/test/unit_test.hpp>
 #include <list>