update readme [ci skip]

Author: rusty1s

README.md

@@ -36,7 +36,7 @@ We provide pip wheels for all major OS/PyTorch/CUDA combinations, see [here](htt
 To install the binaries for PyTorch 1.6.0, simply run
 
 ```
-pip install torch-scatter==latest+${CUDA} torch-sparse==latest+${CUDA} -f https://pytorch-geometric.com/whl/torch-1.5.0.html
+pip install torch-scatter==latest+${CUDA} torch-sparse==latest+${CUDA} -f https://pytorch-geometric.com/whl/torch-1.6.0.html
 ```
 
 where `${CUDA}` should be replaced by either `cpu`, `cu92`, `cu101` or `cu102` depending on your PyTorch installation.