Update requirements in documentation

This is why you keep it DRY.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>

Author: stephencelis

Documentation/Index.md

@@ -63,7 +63,7 @@
 
 ## Installation
 
-> _Note:_ SQLite.swift requires Swift 1.1 (and [Xcode 6.1](https://developer.apple.com/xcode/downloads/)) or greater.
+> _Note:_ SQLite.swift requires Swift 1.2 (and [Xcode 6.3](https://developer.apple.com/xcode/downloads/)) or greater.
 
 To install SQLite.swift as an Xcode sub-project: