title: Simulator is not working with upgrading xcode 10?
body: <p>After updating the Xcode 9.4.1 to Xcode 10, no one simulator is working to build the iOS application. 
  My iOS Application was building and running perfectly on Xcode 9.4.1 </p>
  
  <p>I have multiple warnings like this:</p>
  
  <blockquote>
    <p>warning: The iOS Simulator deployment target is set to 7.0, but the
    range of supported deployment target versions for this platform is 8.0
    to 12.0.</p>
  </blockquote>
  
  <p>ScreenShot for Xcode10 error :</p>
  
  <p><a href="https://i.stack.imgur.com/zOegi.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zOegi.png" alt="enter image description here"></a></p>
  
  <p>And showing Multiple command produced in logs.</p>
  
  <p>I have tried following approaches :</p>
  
  <ul>
  <li><p>Delete derived data</p></li>
  <li><p>Restart xcode</p></li>
  <li><p>Create simulator manually from Xcode>Device/Simulator </p></li>
  </ul>
  
  <p>Not one works for me. Please guide me.</p>