Update pre-commit hooks
diff --git a/pre_commit_hooks/autopep8_wrapper.py b/pre_commit_hooks/autopep8_wrapper.py
index c2f5ee7..a79a120 100644
--- a/pre_commit_hooks/autopep8_wrapper.py
+++ b/pre_commit_hooks/autopep8_wrapper.py
@@ -2,10 +2,11 @@
 from __future__ import print_function
 from __future__ import unicode_literals
 
-import autopep8
 import io
 import sys
 
+import autopep8
+
 
 def main(argv=None):
     argv = argv if argv is not None else sys.argv[1:]
diff --git a/pre_commit_hooks/check_json.py b/pre_commit_hooks/check_json.py
index 1f2cbf9..8328cc7 100644
--- a/pre_commit_hooks/check_json.py
+++ b/pre_commit_hooks/check_json.py
@@ -2,6 +2,7 @@
 
 import argparse
 import sys
+
 import simplejson
 
 
diff --git a/pre_commit_hooks/check_yaml.py b/pre_commit_hooks/check_yaml.py
index 406800b..0085807 100644
--- a/pre_commit_hooks/check_yaml.py
+++ b/pre_commit_hooks/check_yaml.py
@@ -2,6 +2,7 @@
 
 import argparse
 import sys
+
 import yaml
 
 
diff --git a/pre_commit_hooks/trailing_whitespace_fixer.py b/pre_commit_hooks/trailing_whitespace_fixer.py
index 5350fe2..7ac3d73 100644
--- a/pre_commit_hooks/trailing_whitespace_fixer.py
+++ b/pre_commit_hooks/trailing_whitespace_fixer.py
@@ -3,6 +3,7 @@
 import argparse
 import fileinput
 import sys
+
 from plumbum import local