Update LICENSE.txt

[ROCm/rccl commit: 234c8c9ef3]

projects/rccl/LICENSE.txt

@@ -1,5 +1,5 @@
 
- Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
+ Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
 
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions