Use correct package name.

src/antsibull_core/args.py

@@ -14,16 +14,17 @@ class InvalidArgumentError(Exception):
     """A problem parsing or validating a command line argument."""
 
 
-def get_toplevel_parser(**kwargs) -> argparse.ArgumentParser:
+def get_toplevel_parser(package, **kwargs) -> argparse.ArgumentParser:
     """
     Create a toplevel argument parser with options common across all scripts.
 
+    :arg package: The Python package containing this CLI program.
     :args kwargs: This function takes any keyword arguments and passes them directly on to
         the :class:`argparse.ArgumentParser` constructor.
     :returns: :class:`argparse.ArgumentParser` with common script arguments added.
     """
     try:
-        version = metadata.version('antsibull')
+        version = metadata.version(package)
     except metadata.PackageNotFoundError:
         # If there's no metadata foun, assume we're running from source
         version = 'source'