code: def messages
        data = api('pm.history', :receiverid => id)
        data['history'].map {|attrs| Message.new(client, attrs)}
      end
docs: Gets the private conversation history with this user.
  
   @return [Array<Turntabler::Message>]
   @raise [Turntabler::Error] if the command fails
   @example
     user.messages   # => [#<Turntabler::Message ...>, ...]