Merge branch '4.0' of https://github.com/SlackKit/SlackKit into 4.0

Author: Peter Zignego

README.md

@@ -1,6 +1,6 @@
 <p align="center"><img src="https://cloud.githubusercontent.com/assets/8311605/24083714/e921a0d4-0cb2-11e7-8384-d42113ef5056.png" alt="SlackKit" width="500"/></p>
 
-![Swift Version](https://img.shields.io/badge/Swift-3.0.2-orange.svg)
+![Swift Version](https://img.shields.io/badge/Swift-3.1.1-orange.svg)
 ![Plaforms](https://img.shields.io/badge/Platforms-macOS,iOS,tvOS,Linux-lightgrey.svg)
 ![License MIT](https://img.shields.io/badge/License-MIT-lightgrey.svg)
 [![SwiftPM compatible](https://img.shields.io/badge/SwiftPM-compatible-brightgreen.svg)](https://github.com/apple/swift-package-manager)