Updates README

Author: simonmitchell

README.md

@@ -1,6 +1,6 @@
 # Thunder Collection
 
-[![Build Status](https://travis-ci.org/3sidedcube/ThunderCollection.svg)](https://travis-ci.org/3sidedcube/ThunderCollection) [![Swift 5](http://img.shields.io/badge/swift-5-brightgreen.svg)](https://swift.org/blog/swift-5-released/) [![Apache 2](https://img.shields.io/badge/license-Apache%202-brightgreen.svg)](LICENSE.md)
+[![Build Status](https://travis-ci.org/3sidedcube/ThunderCollection.svg)](https://travis-ci.org/3sidedcube/ThunderCollection) [![Swift 5.1](http://img.shields.io/badge/swift-5.1-brightgreen.svg)](https://swift.org/blog/swift-5-1-released/) [![Apache 2](https://img.shields.io/badge/license-Apache%202-brightgreen.svg)](LICENSE.md)
 
 Thunder Collection is a useful framework which enables quick and easy creation of collection views in iOS using a declarative approach. It makes the process of creating complex collection views as simple as a few lines of code; and removes the necessity for having long chains of index paths and if statements.