README: update torch/torchvision support table (#4133)

Author: adamjstewart

README.rst

@@ -23,6 +23,10 @@ supported Python versions.
 +==========================+==========================+=================================+
 | ``master`` / ``nightly`` | ``master`` / ``nightly`` | ``>=3.6``                       |
 +--------------------------+--------------------------+---------------------------------+
+| ``1.9.0``                | ``0.10.0``               | ``>=3.6``                       |
++--------------------------+--------------------------+---------------------------------+
+| ``1.8.1``                | ``0.9.1``                | ``>=3.6``                       |
++--------------------------+--------------------------+---------------------------------+
 | ``1.8.0``                | ``0.9.0``                | ``>=3.6``                       |
 +--------------------------+--------------------------+---------------------------------+
 | ``1.7.1``                | ``0.8.2``                | ``>=3.6``                       |
@@ -71,7 +75,7 @@ From source:
     # MACOSX_DEPLOYMENT_TARGET=10.9 CC=clang CXX=clang++ python setup.py install
 
 
-In case building TorchVision from source fails, install the nightly version of PyTorch following 
+In case building TorchVision from source fails, install the nightly version of PyTorch following
 the linked guide on the  `contributing page <https://github.com/pytorch/vision/blob/master/CONTRIBUTING.md#development-installation>`_ and retry the install.
 
 By default, GPU support is built if CUDA is found and ``torch.cuda.is_available()`` is true.