fixed flake8 issues

tests/rules/test_git_log.py

@@ -22,4 +22,4 @@ def test_not_match(script):
     ('git lock', 'git log'),
     ('git lock --help', 'git log --help')])
 def test_get_new_command(script, output):
-    assert get_new_command(Command(script, '')) == output
+    assert get_new_command(Command(script, '')) == output

thefuck/rules/git_log.py

@@ -1,10 +1,11 @@
-from thefuck.shells import shell
 from thefuck.specific.git import git_support
 
+
 @git_support
 def match(command):
     return 'git: \'lock\' is not a git command.' in command.output
 
+
 @git_support
 def get_new_command(command):
     return command.script.replace('lock', 'log', 1)