Bump vuex-persistedstate from 3.0.1 to 3.1.0

Bumps [vuex-persistedstate](https://github.com/robinvdvleuten/vuex-persistedstate) from 3.0.1 to 3.1.0.
- [Release notes](https://github.com/robinvdvleuten/vuex-persistedstate/releases)
- [Changelog](https://github.com/robinvdvleuten/vuex-persistedstate/blob/master/CHANGELOG.md)
- [Commits](https://github.com/robinvdvleuten/vuex-persistedstate/compare/v3.0.1...v3.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -20,7 +20,7 @@
     "nuxt-buefy": "^0.3.31",
     "nuxt-shopify": "^1.10.1",
     "sass-loader": "^10.0.3",
-    "vuex-persistedstate": "^3.0.1"
+    "vuex-persistedstate": "^3.1.0"
   },
   "devDependencies": {
     "@nuxtjs/eslint-config": "^2.0.2",