fix(meta): fix mergeMeta cjs export

Author: pi0

lib/meta/meta.merge.js

@@ -1,4 +1,4 @@
-exports.mergeMeta = function mergeMeta (to, from) {
+module.exports = function mergeMeta (to, from) {
   if (typeof to === 'function') {
     // eslint-disable-next-line no-console
     console.warn('Cannot merge meta. Avoid using head as a function!')

lib/meta/module.js

@@ -1,7 +1,7 @@
 const { join, resolve } = require('path')
 const { existsSync } = require('fs')
 const { isUrl } = require('../utils')
-const { mergeMeta } = require('./meta.merge')
+const mergeMeta = require('./meta.merge')
 
 module.exports = function nuxtMeta (pwa) {
   const { nuxt } = this

lib/meta/plugin.js

@@ -1,5 +1,5 @@
 import meta from './meta.json'
-import { mergeMeta } from './meta.merge'
+import mergeMeta from './meta.merge'
 
 export default function ({ app }) {
   mergeMeta(app.head, meta)