chore(package): update @vue/cli-plugin-babel to version 4.2.2

Closes #53

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "vuex-persistedstate": "^2.5.4"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "^3.8.0",
+    "@vue/cli-plugin-babel": "^4.2.2",
     "@vue/cli-plugin-eslint": "^3.1.5",
     "@vue/cli-plugin-unit-jest": "^3.10.0",
     "@vue/cli-service": "^3.3.1",