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: mcabber.rb
    path of file: ./repos/homebrew-core/Formula/m
    
    the code of the file until where you have to start completion: class Mcabber 
    
  def caveats
    <<~EOS
      A configuration file is necessary to start mcabber.  The template is here:
        #{opt_pkgshare}/mcabberrc.example
      And there is a Getting Started Guide you will need to setup Mcabber:
        https://wiki.mcabber.com/#index2h1
    EOS
  end