let pre-commit fix some stuff

pre_commit_hooks/pretty_format_json.py

diff --git a/pre_commit_hooks/pretty_format_json.py b/pre_commit_hooks/pretty_format_json.py
index a1dccc0..91dae8d 100644
--- a/pre_commit_hooks/pretty_format_json.py
+++ b/pre_commit_hooks/pretty_format_json.py
@@ -7,7 +7,6 @@
 import simplejson
 
 
-
 def _get_pretty_format(contents, indent, sort_keys=True, top_keys=[]):
     def pairs_first(pairs):
         before = [pair for pair in pairs if pair[0] in top_keys]
@@ -50,10 +49,12 @@
                 'Negative integer supplied to construct JSON indentation delimiter. ',
             )
 
+
 def parse_topkeys(s):
     # type: (str) -> array
     return s.split(',')
 
+
 def pretty_format_json(argv=None):
     parser = argparse.ArgumentParser()
     parser.add_argument(

tests/pretty_format_json_test.py

diff --git a/tests/pretty_format_json_test.py b/tests/pretty_format_json_test.py
index df2152a..72c2b86 100644
--- a/tests/pretty_format_json_test.py
+++ b/tests/pretty_format_json_test.py
@@ -64,14 +64,17 @@
     ret = pretty_format_json([srcfile.strpath])
     assert ret == 0
 
+
 def test_orderfile_get_pretty_format():
     ret = pretty_format_json(['--top-keys=alist', get_resource_path('pretty_formatted_json.json')])
     assert ret == 0
 
+
 def test_not_orderfile_get_pretty_format():
     ret = pretty_format_json(['--top-keys=blah', get_resource_path('pretty_formatted_json.json')])
     assert ret == 1
 
+
 def test_badfile_pretty_format_json():
     ret = pretty_format_json([get_resource_path('ok_yaml.yaml')])
     assert ret == 1