V2.1.0 Make category OnlyList as per spec

Closes #50

Author: dhvcc

poetry.lock

@@ -49,6 +49,7 @@ pre-commit = "^2.12.0"
 ruff = "*"
 rich = "*"
 pytest = "^7.4.0"
+requests = "^2.32.3"
 
 [tool.pytest.ini_options]
 addopts = "--color=yes"

pyproject.toml

@@ -47,7 +47,7 @@ class OptionalChannelElementsMixin(XMLBaseModel):
     last_build_date: Optional[Tag[DateTimeOrStr]] = None  # Sat, 07 Sep 2002 09:42:31 GMT
     "The last time the content of the channel changed."
 
-    category: Optional[Tag[str]] = None  # Newspapers
+    categories: Optional[OnlyList[Tag[str]]] = pydantic.Field(alias="category", default=[])
     "Specify one or more categories that the channel belongs to. Follows the same rules as the <item.py>-level " "category element."  # noqa
 
     generator: Optional[Tag[str]] = None  # MightyInHouse Content System v2.3

rss_parser/models/rss/channel.py

@@ -26,7 +26,7 @@ class OptionalItemElementsMixin(XMLBaseModel):
     author: Optional[Tag[str]] = None
     "Email address of the author of the item."
 
-    category: Optional[Tag[str]] = None
+    categories: Optional[OnlyList[Tag[str]]] = pydantic.Field(alias="category", default=[])
     "Includes the item in one or more categories."
 
     comments: Optional[Tag[str]] = None