Merge pull request #2211 from jku/metafile-default-version

Metadata API: set default version for MetaFile()

Author: Lukas Pühringer

tuf/api/metadata.py

@@ -1076,7 +1076,7 @@ class MetaFile(BaseFile):
 
     def __init__(
         self,
-        version: int,
+        version: int = 1,
         length: Optional[int] = None,
         hashes: Optional[Dict[str, str]] = None,
         unrecognized_fields: Optional[Dict[str, Any]] = None,