update LICENSE.txt file

LICENSE.txt

-VTKm License Version 1.0
+VTKm License Version 1.4
 ========================================================================
 
-Copyright (c) 2014,
+Copyright (c) 2014-2019
+Kitware Inc.,
 National Technology & Engineering Solutions of Sandia, LLC (NTESS),
-Los Alamos National Security, LLC., UT-Battelle, LLC., Kitware Inc.,
-University of California Davis
+UT-Battelle, LLC.,
+Los Alamos National Security, LLC.,
 All rights reserved.
 
-Sandia National Laboratories, New Mexico
-PO Box 5800
-Albuquerque, NM 87185
-USA
-
-UT-Battelle
-1 Bethel Valley Rd
-Oak Ridge, TN 37830
-
-Los Alamos National Security, LLC
-105 Central Park Square
-Los Alamos, NM 87544
-
-Kitware Inc.
-28 Corporate Drive
-Clifton Park, NY 12065
-USA
-
-University of California, Davis
-One Shields Avenue
-Davis, CA 95616
-USA
-
 Under the terms of Contract DE-NA0003525 with NTESS, the U.S. Government
 retains certain rights in this software.
 
@@ -80,4 +58,3 @@ vtkm/testing/OptionParser.h
 vtkm/thirdparty
 vtkm/internal/brigand.hpp
 version.txt
-