title: Xcode 8.3 can't support Swift 2.3
body: <p>I'm using Swift 2.3 in my project. Yesterday, I updated Xcode to version 8.3 but my project can't build successfully any more. I got this error message.</p>
  
  <blockquote>
    <p>“Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift. Use the [Edit > Convert > To Current Swift Syntax…] menu to choose a Swift version or use the Build Settings editor to configure the build setting directly.</p>
  </blockquote>
  
  <p>Please help me! Thanks!</p>