Update README.md

README.md

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 Crypto related functions and helpers for [Swift](https://developer.apple.com/swift/) implemented in Swift. ([#PureSwift](https://twitter.com/hashtag/pureswift))
 
+## Swift 3
+
+You can find preliminary Swift 3 support from branch [swift3](https://github.com/krzyzanowskim/CryptoSwift/tree/swift3).
+
 #Table of Contents
 - [Requirements](#requirements)
 - [Features](#features)