class RuboCop::Cop::Gemspec::RequireMFA

def correct_metadata(corrector, metadata)
  if metadata.pairs.any?
    corrector.insert_after(metadata.pairs.last, ",\n'rubygems_mfa_required' => 'true'")
  else
    corrector.insert_before(metadata.loc.end, "'rubygems_mfa_required' => 'true'")
  end
end