Update README to link to NCCL2

[ROCm/rccl commit: 80ae43b443]
2017-08-04 09:42:25 -07:00
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+** IMPORTANT NOTE **
+** NCCL1 is no longer maintained/updated and has been replaced by NCCL2, available at http://developer.nvidia.com/nccl. **
+
 # NCCL

 Optimized primitives for collective multi-GPU communication.