Updated CLI version to acquire version from file

xls_updater/cli.py

@@ -4,11 +4,12 @@
 
 import click
 
+from xls_updater.__about__ import __version__
 from xls_updater.app import convert_xls_to_xlsx
 
 
 @click.group(invoke_without_command=True, no_args_is_help=True)
-@click.version_option()
+@click.version_option(__version__, "-v", "--version", is_flag=True, help="Show the version.")
 @click.argument("src_file_path", type=click.Path(exists=True, path_type=pathlib.Path), required=True)
 def cli(src_file_path: pathlib.Path) -> None:
     """Convert an xls file to xlsx."""