message: chore: use template strings in config.js
diff: @@ -10,8 +10,8 @@ const weexVersion = process.env.WEEX_VERSION || require('../packages/weex-vue-fr
  const banner =
  '/*!\n' +
  - ' * Vue.js v' + version + '\n' +
  - ' * (c) 2014-' + new Date().getFullYear() + ' Evan You\n' +
  + ` * Vue.js v${version}\n` +
  + ` * (c) 2014-${new Date().getFullYear()} Evan You\n` +
  ' * Released under the MIT License.\n' +
  ' */'
  