chore(utils): mark ExistingDirectory and ExistingFile as deprecated

src/jcloud_docsgen/utils.py

@@ -22,6 +22,12 @@ import errno
 from typing import Union
 import types
 
+try:
+    from warnings import deprecated
+except ImportError:
+    from typing_extensions import deprecated
+
+@deprecated('Use pathlib.Path instead.')
 class ExistingDirectory(pathlib.Path):
     '''
     pathlib.Path subclass that is a directory.
@@ -37,6 +43,7 @@ class ExistingDirectory(pathlib.Path):
             raise NotADirectoryError(errno.ENOTDIR, 'not a directory', path)
         super().__init__(*(path, *args), **kwargs)
 
+@deprecated('Use pathlib.Path instead.')
 class ExistingFile(pathlib.Path):
     '''
     pathlib.Path subclass that is a file.