def format_diff
      gemfile.changes.map do |gem, details|
        ERB.new(template, nil, '<>').result(binding)
      end
    end
def format_diff
      gemfile.changes.map do |gem, details|
        ERB.new(template, nil, '<>').result(binding)
      end
    end
Format the diff to get human readable information
 on the gems that were updated.