Fix #523: metadata:url was not allowed for base sets

Author: rubidium42

bananas_api/new_upload/readers/base_graphics.py

@@ -13,6 +13,7 @@ class BaseGraphics(BaseSet):
             "description": str,
             "palette": str,
             "blitter": str,
+            "url": str,
         },
         "files": {
             "base": str,

bananas_api/new_upload/readers/base_music.py

@@ -11,6 +11,7 @@ class BaseMusic(BaseSet):
             "shortname": str,
             "version": str,
             "description": str,
+            "url": str,
         },
         "files": {
             "theme": str,

bananas_api/new_upload/readers/base_sounds.py

@@ -11,6 +11,7 @@ class BaseSounds(BaseSet):
             "shortname": str,
             "version": str,
             "description": str,
+            "url": str,
         },
         "files": {
             "samples": str,