update license headers to LGPL

Change-Id: Ia2b137231437f6c3c0f4af49fba1a7bdc320ed4a
diff --git a/tests/unit-test-time-fixture.hpp b/tests/unit-test-time-fixture.hpp
index 36293a8..5831500 100644
--- a/tests/unit-test-time-fixture.hpp
+++ b/tests/unit-test-time-fixture.hpp
@@ -1,19 +1,19 @@
 /* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
 /*
- * Copyright (c) 2012-2018  University of California, Los Angeles
+ * Copyright (c) 2012-2019  University of California, Los Angeles
  *                          The University of Memphis
  *
  * This file is part of PSync.
  *
  * PSync is free software: you can redistribute it and/or modify it under the terms
- * of the GNU General Public License as published by the Free Software Foundation, either
+ * of the GNU Lesser General Public License as published by the Free Software Foundation, either
  * version 3 of the License, or (at your option) any later version.
  *
  * PSync is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
- * PURPOSE.  See the GNU General Public License for more details.
+ * PURPOSE.  See the GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along with
+ * You should have received a copy of the GNU Lesser General Public License along with
  * PSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  */