Doesn't work with <%= pkg.name %> tags about postcss-banner HOT 5 CLOSED

 var autoprefixer = require('autoprefixer-core'),
      cssURLs = require('postcss-url'),
      cssBanner = require('postcss-banner');

      postcss: {
            build:{
                options: {
                    map: false,
                    processors: [
                        cssBanner({
                            banner: ' \n' +
                                    'Theme Name: Theme Name \n' +
                                    'Version: <%= pkg.version %> \n' +
                                    'Theme URI: http://mydomain.com\n' +
                                    'Author: <%= pkg.author %> \n' +
                                    'Author URI: https://mydomain.com\n' +
                                    'Description: <%= pkg.description %> \n' +
                                    'Text domain: <%= pkg.name %>\n'
                        })
                    ]
                },
                src: 'style.css',
                dest: 'style.css'
            },
            dev: {
                options: {
                    map: false,
                    processors: [
                        cssURLs({
                            url :"rebase"
                        })
                    ]
                },
                src: '<%= project.css %>dev.css',
                dest: '<%= project.css %>dev.css'
            },
            dist: {
                options: {
                    map: true,
                    processors: [
                        autoprefixer({
                            browsers: ['> 0.5%', 'last 2 versions', 'Firefox ESR', 'Opera 12.1']
                        }), // add vendor prefixes
                        cssURLs({
                            url :"rebase"
                        })
                    ]
                },
                src: '<%= project.css %><%= project.app %>.min.css',
                dest: '<%= project.dist %><%= project.app %>.min.css'
            }
        },