title: Dynamically updating the passed parameter in the vue component
body: <p>I have component:</p>
  <pre><code>&lt;g :title=&quot;computeString&quot;&gt;&lt;/g&gt;
  </code></pre>
  <p>(standart element)</p>
  <p>I use computed property to update it</p>
  <pre><code> computeString:{
       get: function () {
         console.log(this.cage.hitch);
         return this.cage.hitch
       },
       set: function(newValue) {
         return newValue;
       }
     },
  </code></pre>
  <p>But when I update the calculated field, the title is not updated.</p>
  <p>How to dynamically update?</p>
  <p>Try 2:</p>
  <pre><code>computeString:{
          get: function () {
            console.log(this.cage.hitch);
           return this.cage.hitch
      },
      set: function(newValue) {
        this.cage.hitch = newValue;
         }
      },
  </code></pre>
  <p>Not work.</p>