old_contents: from .irc_level import IRCLevel
  from .irc_message import IRCMessage
  from .irc_bot import IRCBot, command, match, sink, action
  
new_contents: from .irc_level import IRCLevel
  from .irc_message import IRCMessage
  from .irc_bot import IRCBot, hook, command, match, sink, action
  
subject: Add hook to init