update license headers to LGPL

Change-Id: Ia2b137231437f6c3c0f4af49fba1a7bdc320ed4a

tests/main.cpp

@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2019,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -12,14 +12,14 @@
  * See AUTHORS.md for complete list of PSync authors and contributors.
  *
  * 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,
+ * 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/>.
  */