[cleanup] Sort imports

Using https://github.com/PyCQA/isort

    isort -m VERTICAL_HANGING_INDENT --py 36 -l 80 --rr -n --tc .

setup.py

@@ -1,13 +1,13 @@
 #!/usr/bin/env python3
 import os.path
-import warnings
 import sys
+import warnings
 
 try:
-    from setuptools import setup, Command, find_packages
+    from setuptools import Command, find_packages, setup
     setuptools_available = True
 except ImportError:
-    from distutils.core import setup, Command
+    from distutils.core import Command, setup
     setuptools_available = False
 from distutils.spawn import spawn