add completion files generated by shtab

tox.ini

@@ -32,9 +32,13 @@ deps =
 	{[tox]dependencies}
 	-e .[docs]
 changedir = src
+allowlist_externals =
+	/bin/bash
 setenv =
 	SPHINX_APIDOC_OPTIONS=members,no-undoc-members,show-inheritance
 commands =
+	/bin/bash -c 'shtab --shell bash --prefix ahriman --prog ahriman ahriman.application.ahriman._parser > ../docs/completions/bash/_ahriman'
+	/bin/bash -c 'shtab --shell zsh --prefix ahriman --prog ahriman ahriman.application.ahriman._parser > ../docs/completions/zsh/_ahriman'
 	argparse-manpage --module ahriman.application.ahriman --function _parser --author "ahriman team" --project-name ahriman --author-email "" --url https://github.com/arcan1s/ahriman --output ../docs/ahriman.1
 	pydeps ahriman -o ../docs/ahriman-architecture.svg --no-config --no-show --cluster
 	sphinx-apidoc -o ../docs .