[Snyk] Upgrade vuex from 3.1.0 to 3.1.1

[snyk-bot]

Snyk has created this PR to upgrade vuex from 3.1.0 to 3.1.1.

• The recommended version is 1 version ahead of your current version.
• The recommended version was released 6 months ago, on 2019-05-08.

Release notes

• Package name: vuex
  • 3.1.1 - 2019-05-08

    Features

    • Support for debugging Vuex in a NativeScript application with the standalone Vue Devtools app (#1404)
    • New ES modules build for browser (#1533): vuex.esm.browser.js and vuex.esm.browser.min.js

    Improvements

    • Improved jsdelivr support (#1496)

    Fixed

    • Memory leak happening while using registerModule/unregisterModule (#1508)
    • Typings: Make mutation and action payload optional in definition file (#1517)
  • 3.1.0 - 2019-01-17

    Features

    • store.subscribeAction can now specify whether the handler should be invoked before the action, after the action, or both. 76818c1 (#1115 by @wa3l)

    Improvements

    • Errors thrown inside action subscribers no longer cause the entire action to fail.
from [`vuex` GitHub Release Notes](https://github.com/vuejs/vuex/releases)

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