Update copyright dates for the dashboard.

Author: amartini51

index.html

@@ -1,7 +1,7 @@
 <!--====== index.html - Swift Evolution ========================================
 This source file is part of the Swift.org open source project
 
-Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
+Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
 Licensed under Apache License v2.0 with Runtime Library Exception
 
 See http://swift.org/LICENSE.txt for license information
@@ -83,7 +83,7 @@ <h1 id="title"><a href=".">Swift Evolution</a></h1>
  </main>
  <footer>
  <div class="footer-contents">
- <p>Copyright © 2017–2019 Apple Inc. All rights reserved.</p>
+ <p>Copyright © 2017–2020 Apple Inc. All rights reserved.</p>
  <p>
  Swift and the Swift logo are trademarks of Apple Inc.
  For more information about the Swift project, see <a href="https://swift.org">Swift.org</a>.