fix(scoped-css): whitelist data-v-* attributes (#75)

Author: simllll

lib/module.js

@@ -27,7 +27,8 @@ export default function nuxtPurgeCss(moduleOptions) {
     styleExtensions: ['.css'],
     whitelist: ['body', 'html', 'nuxt-progress', '__nuxt', '__layout'],
     whitelistPatterns: [
-      /.*-(enter|enter-active|enter-to|leave|leave-active|leave-to)/
+      /.*-(enter|enter-active|enter-to|leave|leave-active|leave-to)/,
+      /data-v-.*/ // this is needed to prevent removing used scoped css classes
     ],
     whitelistPatternsChildren: [],
     extractors: [