Bump vuex from 3.1.0 to 3.4.0

Bumps [vuex](https://github.com/vuejs/vuex) from 3.1.0 to 3.4.0.
- [Release notes](https://github.com/vuejs/vuex/releases)
- [Changelog](https://github.com/vuejs/vuex/blob/dev/CHANGELOG.md)
- [Commits](vuejs/vuex@v3.1.0...v3.4.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -17,7 +17,7 @@
     "vue-multiselect": "^2.1.6",
     "vue-router": "^3.0.6",
     "vue-rx": "^6.1.0",
-    "vuex": "^3.0.1",
+    "vuex": "^3.4.0",
     "vuex-persistedstate": "^2.5.4"
   },
   "devDependencies": {