feat(cli): add __all__ to cli.cli module

src/jcloud_docsgen/cli/cli.py

@@ -25,6 +25,13 @@ import pathlib
 import sys
 from .parsers.python import VALID_SECTIONS as VALID_PYTHON_SECTIONS
 
+__all__ = [
+    'existing_directory',
+    'error',
+    'create_argument_parser',
+    'main'
+]
+
 _LANG_PYTHON = 'python'
 _PROGRAM_NAME = 'jcloud-docsgen'