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: julia.rb
    path of file: ./repos/libraries.io/app/models/package_manager
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module PackageManager
  class Julia < Base
    HAS_VERSIONS = false
    HAS_DEPENDENCIES = false
    BIBLIOTHECARY_SUPPORT = 
    
    def self.project(name)
      versions = `ls METADATA.jl/#{name}/versions`.split("\n").sort
      repository_url = `cat METADATA.jl/#{name}/url`
      {
        name: name,
        versions: versions,
        repository_url: repository_url,
      }
    end