old_contents: from .version import __version__
  # TODO just import *?
  from .hangouts_pb2 import (
      TYPING_TYPE_STARTED, TYPING_TYPE_PAUSED, TYPING_TYPE_STOPPED,
      MEMBERSHIP_CHANGE_TYPE_LEAVE, MEMBERSHIP_CHANGE_TYPE_JOIN
  )
  from .client import Client
  from .user import UserList, build_user_list
  from .conversation import ConversationList
  from .auth import get_auth, get_auth_stdin, GoogleAuthError
  from .exceptions import HangupsError, NetworkError
  from .conversation_event import (ChatMessageSegment, ConversationEvent,
                                   ChatMessageEvent, RenameEvent,
                                   MembershipChangeEvent)
  
new_contents: from .version import __version__
  from .client import Client
  from .user import UserList, build_user_list
  from .conversation import ConversationList
  from .auth import get_auth, get_auth_stdin, GoogleAuthError
  from .exceptions import HangupsError, NetworkError
  from .conversation_event import (ChatMessageSegment, ConversationEvent,
                                   ChatMessageEvent, RenameEvent,
                                   MembershipChangeEvent)
  # Only import enum values and messages from the proto file that are necessary
  # for third-party code to use hangups.
  from .hangouts_pb2 import (
      TYPING_TYPE_STARTED, TYPING_TYPE_PAUSED, TYPING_TYPE_STOPPED,
      MEMBERSHIP_CHANGE_TYPE_LEAVE, MEMBERSHIP_CHANGE_TYPE_JOIN
  )
  
subject: Add comment about proto file imports in __init__