You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: postgres_hashdump.rb
    path of file: ./repos/metasploit-framework/modules/auxiliary/scanner/postgres
    
    the code of the file until where you have to start completion: ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::Postgres
  include Msf::Auxiliary::Report
  include Msf::Auxiliary::Scanner
  include Msf::OptionalS
    
  def initialize
    super(
      'Name'           => 'Postgres Password Hashdump',
      'Description'    => %Q{
          This module extracts the usernames and encrypted password
        hashes from a Postgres server and stores them for later cracking.
      },
      'Author'         => ['theLightCosine'],
      'License'        => MSF_LICENSE
    )
    deregister_options('SQL', 'RETURN_ROWSET', 'VERBOSE')

  end