title: Vuex + vue not reactive when using dictionary as state object
body: <p>I need to use dictionary as one of my store variables, but It's not reactive like array, what is the best practice to solve this?
  I've created minimal example:</p>
  <p><a href="https://codesandbox.io/s/vuex-store-forked-ko3md?file=/src/App.vue" rel="nofollow noreferrer">https://codesandbox.io/s/vuex-store-forked-ko3md?file=/src/App.vue</a></p>