fix: add __nuxt & __layout to whitelist (#36)

Author: kevinmarrec

lib/module.js

@@ -25,7 +25,7 @@ export default function nuxtPurgeCss(moduleOptions) {
       'plugins/**/*.js'
     ],
     styleExtensions: ['.css'],
-    whitelist: ['body', 'html', 'nuxt-progress'],
+    whitelist: ['body', 'html', 'nuxt-progress', '__nuxt', '__layout'],
     whitelistPatterns: [],
     whitelistPatternsChildren: [],
     extractors: [