update torchvision version

Author: taigw

requirements.txt

@@ -1,11 +1,12 @@
 matplotlib>=3.1.2
 numpy>=1.17.4
+torch>=1.7.1
 pandas>=0.25.3
 scikit-image>=0.16.2
 scikit-learn>=0.22
 scipy>=1.3.3
 SimpleITK>=1.2.4
 tensorboard>=2.1.0
 tensorboardX>=1.9
-torchvision>=1.0.1
+torchvision>=0.8.2
 PYMIC==0.2.3