Update README.md

Added bages: swift version and stackoverflow ask

Author: TonioMacaronio

README.md

@@ -5,8 +5,10 @@
 [![Version](https://img.shields.io/cocoapods/v/web3swift.svg?style=flat)](http://cocoapods.org/pods/web3swift)
 [![License](https://img.shields.io/cocoapods/l/web3swift.svg?style=flat)](http://cocoapods.org/pods/web3swift)
 [![Platform](https://img.shields.io/cocoapods/p/web3swift.svg?style=flat)](http://cocoapods.org/pods/web3swift)
+[![Swift](https://img.shields.io/badge/Swift-4.0-orange.svg?style=flat)](https://developer.apple.com/swift/)
 [![support](https://brianmacdonald.github.io/Ethonate/svg/eth-support-blue.svg)](https://brianmacdonald.github.io/Ethonate/address#0xe22b8979739d724343bd002f9f432f5990879901)
 [![Build Status](https://travis-ci.com/matterinc/web3swift.svg?branch=develop)](https://travis-ci.com/matterinc/web3swift)
+[![Stackoverflow](https://img.shields.io/badge/stackoverflow-ask-blue.svg)](https://stackoverflow.com/questions/tagged/web3swift)
 
 <img align="left" width="25" height="25" src="https://user-images.githubusercontent.com/28599454/41086111-af4bc3b0-6a41-11e8-9f9f-2d642b12666e.png">[Ask questions](https://stackoverflow.com/questions/tagged/web3swift)