lint whitespace.

greentest/greentest.py

@@ -47,9 +47,11 @@ else:
 gettotalrefcount = getattr(sys, 'gettotalrefcount', None)
 OPTIONAL_MODULES = ['resolver_ares']
 
+
 class ExpectedException(Exception):
     """An exception whose traceback should be ignored"""
 
+
 def wrap_switch_count_check(method):
     @wraps(method)
     def wrapped(self, *args, **kwargs):