title: Vuex store empty if i refresh my webpage
body: <p>how to keep my store if i refresh a web page ?</p>
  
  <pre><code>    let store = new Vuex.Store( {
      modules: {
          demo, auth
      },
      strict: true
  } );
  
  
  let router = new VueRouter( {
      mode: 'history',
      saveScrollPosition: true,
      routes: routes
  } )
  </code></pre>
  
  <p>I use the history mode but If i reload my webpage, my store is empty.
  There is a solution ?</p>