Update requirements.txt

requirements.txt

@@ -1,3 +1,4 @@
-torch==1.11.0+cu113 torchvision==0.11.0+cu113 torchtext==0.12.0 -f https://download.pytorch.org/whl/torch_stable.html 
+torch>=1.6.0,<1.8.0
+torchvision>=0.8.0,<0.10.0
 icevision[all] --upgrade --no-deps
 loguru --no-deps