old_contents: #! -*- coding:utf-8 -*-
  
  from swf.querysets.activity import ActivityTypeQuerySet
  from swf.querysets.domain import DomainQuerySet
  from swf.querysets.workflow import (WorkflowTypeQuerySet,
                                      WorkflowExecutionQuerySet)
  
new_contents: #! -*- coding:utf-8 -*-
  
  from swf.querysets.activity import ActivityTypeQuerySet
  from swf.querysets.domain import DomainQuerySet
  from swf.querysets.history import HistoryQuerySet
  from swf.querysets.workflow import (WorkflowTypeQuerySet,
                                      WorkflowExecutionQuerySet)
  
subject: Add history qs to swf querysets modules