Updated README.md with the new URL.

Author: smdol

README.md

@@ -3,7 +3,7 @@
 Copyright (c) 2016 Google Inc. All rights reserved.
 
 For first time users, see:
-[https://developers.google.com/vr/unity/get-started](https://developers.google.com/vr/unity/get-started)
+[https://developers.google.com/vr/unity/](https://developers.google.com/vr/unity/)
 
 For updates, known issues, upgrade instructions, see:
 [https://developers.google.com/vr/unity/release-notes](https://developers.google.com/vr/unity/release-notes)