Fix flake8 complaints

Author: bgreen-litl

tests/test_backoff.py

@@ -552,6 +552,7 @@ def test_on_exception_callable_max_tries_reads_every_time(monkeypatch):
     monkeypatch.setattr('time.sleep', lambda x: None)
 
     lookups = []
+
     def lookup_max_tries():
         lookups.append(True)
         return 3

tests/test_backoff_async.py

@@ -1,10 +1,11 @@
 # coding:utf-8
 
 import asyncio  # Python 3.5 code and syntax is allowed in this file
-import backoff
-import pytest
 import random
 
+import pytest
+
+import backoff
 from tests.common import _log_hdlrs, _save_target
 
 
@@ -576,6 +577,7 @@ async def test_on_exception_callable_max_tries_reads_every_time(monkeypatch):
     monkeypatch.setattr('asyncio.sleep', _await_none)
 
     lookups = []
+
     def lookup_max_tries():
         lookups.append(True)
         return 3
@@ -595,7 +597,6 @@ def exceptor():
     assert len(lookups) == 2
 
 
-
 @pytest.mark.asyncio
 async def test_on_exception_callable_gen_kwargs():