[Snyk] Upgrade vuex from 3.0.1 to 3.1.1

[snyk-bot]

Snyk have raised this PR to upgrade vuex from 3.0.1 to 3.1.1.

• The recommended version is 2 versions ahead of your current version.
• The recommended version was released 4 months ago, on 2019-05-08.

Release notes

• 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.
• 3.0.1 - 2017-11-01

  Fixed

  • Type compatibility with TypeScript 2.6

from vuex GitHub Release Notes

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