Updated the docs to reflect we are starting to port to Swift 3

Author: raulriera

README.md

@@ -45,6 +45,7 @@ Currently it features the following effects from the article:
 
 ## Installation
 
+- Looking for Swift 2.3 support? Check out the [1.2.0](https://github.com/raulriera/TextFieldEffects/releases/tag/1.2.0) tag.
 - Looking for Swift 2.1 support? Check out the [1.1.1](https://github.com/raulriera/TextFieldEffects/releases/tag/1.1.1) tag.
 - Looking for Swift 1.2 support? Check out the `swift-1.2` branch.