old_contents: module.exports = function(grunt) {
      // Do grunt-related things in here.
      grunt.initConfig({
          // Project configuration
          pkg: grunt.file.readJSON('package.json'),
  
          jshint: {
              files: ['gruntfile.js'],
          }
      });
  
      // Load the plugins that provides the tasks:
      grunt.loadNpmTasks('grunt-contrib-jshint');
  
      // Default tasks:
      grunt.registerTask('default', ['jshint']);
  
  };
new_contents: module.exports = function(grunt) {
      // Do grunt-related things in here.
      grunt.initConfig({
          // Project configuration
          pkg: grunt.file.readJSON('package.json'),
  
          jshint: {
              files: ['gruntfile.js'],
          },
  
          concat: {
              css: {
                  src: ['node_modules/normalize.css/normalize.css', 'src/css/style.css'],
                  dest: 'dist/style.css'
              }
          }
      });
  
      // Load the plugins that provides the tasks:
      grunt.loadNpmTasks('grunt-contrib-jshint');
      grunt.loadNpmTasks('grunt-contrib-concat');
  
      // Default tasks:
      grunt.registerTask('default', ['jshint', 'concat']);
  
  };
subject: Add 'concat' task to 'gruntfile.js'