v0.2.1

• Added pre-built binary for PyTorch 1.6

CUDA	torch 1.6	torch 1.5	torch 1.4
10.2	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu102/torch1.6/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu102/torch1.5/index.html
10.1	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.6/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.5/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.4/index.html
10.0			install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu100/torch1.4/index.html
9.2	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu92/torch1.6/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu92/torch1.5/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cu92/torch1.4/index.html
cpu	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.6/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.5/index.html	install python -m pip install detectron2==0.2.1 -f \ https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.4/index.html