Sort imports with isort

Keep imports alphabetically sorted and their order homogeneous across
Python source files.

The isort project has more feature and is more active than the
flake8-import-order plugin.

Most issues caught were simply import ordering from the same module.
Where imports were purposefully placed out of order, tag with
isort:skip.

1 files changed, 1 insertions, 0 deletions

diff --git a/sphinx/events.py b/sphinx/events.py
index 214654706..c8d07eb61 100644
--- a/sphinx/events.py
+++ b/sphinx/events.py
@@ -23,6 +23,7 @@ from sphinx.util import logging
 if False:
     # For type annotation
     from typing import Type  # for python3.5.1
+
     from sphinx.application import Sphinx