title: Setting a default value with react-select not working
body: <p>I have a simple React component which gets an initial state:</p>
  
  <pre><code>this.state = {
    currentObject: {
      isYounger: false
    }
  }
  </code></pre>
  
  <p>I then render a <code>react-select</code> with the default value of <code>this.state.currentObject.isYounger</code>:</p>
  
  <pre><code>    &lt;Select
        name={"age"}
        value={this.state.currentObject.isYounger}
        onChange={newValue =&gt; this.addIsYoungerValue(newValue)}
        options={isYoungerOptions}
      /&gt;
  </code></pre>
  
  <p>For some reason, the value is not set. Why is this?</p>
  
  <p><a href="https://codesandbox.io/s/mqm14m8q5x?fontsize=14" rel="noreferrer">Codesandbox</a></p>
  
  <p>Version:</p>
  
  <p><code>"react-select": "^2.4.2",</code></p>