Update README.md

README.md

@@ -7,6 +7,10 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 [![Cocoapods Compatible](https://img.shields.io/cocoapods/v/SnapKit.svg)](https://cocoapods.org/pods/SnapKit)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 
+##### ⚠️ **To use with Swift 2.x please ensure you are using == 0.22.0** ⚠️ 
+
+##### ⚠️ **To use with Swift 3.x please ensure you are using >= 3.0.0** ⚠️ 
+
 - [Requirements](#requirements)
 - [Migration Guides](#migration-guides)
 - [Communication](#communication)