Update README.md

in multi tensor apply, skip empty tensors

Tag v0.3.2 works with PyTorch docker up to ROCm4.0, it includes sever…

…al critical bug fixes

Fix LayerNorm op on ROCm (ROCm#36)

* fix warp size in WARP_SHFL* in layernorm

* enable fused_layer_norm tests on ROCm

update readme with ninja build instruction and pip3.6 install (ROCm#35)

Merge pull request ROCm#18 from lcskrishna/cl/readme-updates

[Documentation] Update the readme for ROCm.

Enable support for sparse tensors for multi_tensor_apply (ROCm#6)