[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

conftest.py

@@ -3,6 +3,7 @@
 Therefore, here we allow for the directory to be directly supplied,
 via an environmental variable.
 """
+
 import shutil
 from pathlib import Path
 from uuid import uuid4

jupyter_book/cli/main.py

@@ -2,6 +2,7 @@
 
 IMPORTANT: Top-level imports should be minimised here, to improve CLI responsiveness
 """
+
 import os
 import os.path as op
 import shutil as sh

jupyter_book/cli/pluggable.py

@@ -1,4 +1,5 @@
 """Plugin aware click command Group."""
+
 from typing import Any, Iterable, List, Set
 
 import click

jupyter_book/config.py

@@ -1,4 +1,5 @@
 """A small sphinx extension to let you configure a site with YAML metadata."""
+
 import json
 import sys
 from functools import lru_cache

jupyter_book/pdf.py

@@ -1,4 +1,5 @@
 """Commands to facilitate conversion to PDF."""
+
 import asyncio
 import os
 from copy import copy

jupyter_book/sphinx.py

@@ -1,4 +1,5 @@
 """Tools for interacting with Sphinx."""
+
 import os.path as op
 import sys
 from pathlib import Path

tests/test_clean.py

@@ -1,4 +1,5 @@
 """Testing clean functionality of the CLI."""
+
 import os
 
 from click.testing import CliRunner