Add known networks

hubconf.py

 import torch
 
 def animegan2(pretrained=True, device="cpu", progress=True, check_hash=True):
+    release_url = "https://github.com/xhlulu/animegan2-pytorch/releases/download/weights"
+    known = {
+        name: f"{release_url}/{name}.pt"
+        for name in [
+            'face_paint_512_v0', 'face_paint_512_v2'
+        ]
+    }
+
     from model import Generator
 
     device = torch.device(device)
@@ -8,10 +16,11 @@ def animegan2(pretrained=True, device="cpu", progress=True, check_hash=True):
     model = Generator().to(device)
 
     if type(pretrained) == str:
-        ckpt_url = pretrained
+        # Look if a known name is passed, otherwise assume it's a URL
+        ckpt_url = known.get(pretrained, pretrained)
         pretrained = True
     else:
-        ckpt_url = "https://github.com/xhlulu/animegan2-pytorch/releases/download/weights/face_paint_512_v2_0.pt"
+        ckpt_url = known.get('face_paint_512_v2')
 
     if pretrained is True:
         state_dict = torch.hub.load_state_dict_from_url(