old_contents: module.exports = {
     printWidth: 80,
     singleQuote: true,
     trailingComma: 'es5',
     arrowParens: 'always',
  };
  
new_contents: module.exports = {
    printWidth: 80,
    singleQuote: true,
    trailingComma: 'es5',
    arrowParens: 'always',
  };
  
subject: Update config format