title: An option for select all that gets all values from all other options
body: <p>I'm currently using <strong>semantic ui react</strong> and I have a dropdown that contains options to filter data. But this option relies on mapping from an array. I want to have this option and another option for selecting all of them. How would I display both of these options?</p>
  
  <p>This is my attempt of having both of these options</p>
  
  <pre><code>const projectOptions = this.props.projects.map(project =&gt; ([{
          text: project.name,
          value: project.id.toString(),
          key: project.id
      },
          {
              text: "Select all", value: "select all"
          }
      ]))
  </code></pre>