style: ensure trailing newlines

src/jcloud_docsgen/cli.py

@@ -34,4 +34,4 @@ def main() -> int:
     argument_parser = argparse.ArgumentParser()
     argument_parser.add_argument('project_directory', type = existing_directory, default = pathlib.Path('.'), help = 'The directory of the project')
     args = argument_parser.parse_args()
-    return 0
+    return 0